---
product_id: 437241
title: "Expert"
brand: "kensington"
price: "R2247"
currency: ZAR
in_stock: true
reviews_count: 7
category: "Kensington"
url: https://www.desertcart.co.za/products/437241-expert
store_origin: ZA
region: South Africa
---

# 55mm precision ball patented scroll ring customizable 4-button control Expert

**Brand:** kensington
**Price:** R2247
**Availability:** ✅ In Stock

## Summary

> 🎯 Roll into precision, scroll with ease, work in comfort — the Expert Mouse revolutionizes your desk game.

## Quick Answers

- **What is this?** Expert by kensington
- **How much does it cost?** R2247 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/437241-expert)

## Best For

- kensington enthusiasts

## Why This Product

- Trusted kensington brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Pinpoint Precision at Your Fingertips:** DiamondEye optical tracking on a large 55mm ball delivers unmatched cursor accuracy for detailed work and multi-monitor setups.
- • **Effortless Scrolling, Zero Interruptions:** Patented scroll ring lets you breeze through long documents and web pages without lifting a finger—stay in the flow.
- • **Tailor Your Workflow with Custom Controls:** Fully programmable 4-button setup and adjustable cursor/scroll speeds via KensingtonKonnect software put power in your hands.
- • **Plug-and-Play Reliability with Wired USB-A:** Stable, lag-free connection ensures your productivity never stalls—no batteries, no Bluetooth hassles.
- • **Ergonomic Comfort Meets Ambidextrous Design:** Detachable wrist rest and ambidextrous layout reduce strain during marathon work sessions, designed for every hand.

## Overview

The Kensington Expert Trackball Mouse (K64325) is a wired, ambidextrous input device featuring a large 55mm ball with DiamondEye optical tracking for precise cursor control. It includes a patented scroll ring for smooth navigation, a detachable ergonomic wrist rest for comfort, and four customizable buttons configurable via KensingtonKonnect software. Compatible with most major OS except Windows ARM, it connects via USB-A for reliable performance and is backed by a 5-year warranty, making it a top-tier choice for professionals seeking enhanced productivity and ergonomic design.

## Description

The Expert Mouse Wired Trackball is the ultimate productivity enhancer that makes working at the desk quicker, more accurate and extremely comfortable for your hand and wrist. Featuring DiamondEye technology, the trackball uses optical tracking to precisely follow small flecks embedded in the large 55mm ball to provide smooth, accurate cursor control. The four buttons are customizable using our highly intuitive KensingtonWorks software, while our award winning Scroll Ring lets you quickly scan up and down web pages and large documents. Add it all up and you get exceptional comfort and ease-of-use that has set the industry standard for more than 20 years.

Review: Computer navigation the way it should be! - After having read several reviews around the web and being aware of the potential downsides as well as the upsides, I decided to buy myself one of these. Boy, am I glad I did. Admittedly, I'm the kind of person who's not satisfied with the typical mousing solution (I have really big hands and I do a lot of delicate work) and likes to try new things, so if that's not you then you may want to try one out before you buy if possible, or at least get one with a return policy. Caveat emptor. That being said, short of building a custom one myself, the Kensington Expert Mouse is pretty much what I want in a trackball, and having used it for awhile any regular mouse feels foreign and less-than-intuitive. First, the cons, in order of greatest to least issue (and they're all minor issues to me anyway). :: It does have a bit of a backward slope to it, probably about 10-15 degrees, which my large hands and already-tilted desk find mildly awkward. If you have a desk that's fairly high above your lap, then that backward slant will probably match the angle your arms are already at and this won't be an issue. :: The scroll wheel, as has been mentioned elsewhere, does feel a little scratchy, like a plastic-on-plastic sort of texture. It's not quite the buttery-smooth, gliding motion you expect after using the ball itself (more on that later) - it feels more like the back of a plastic spoon sliding across a Formica counter. That said, mine wasn't that bad, and probably would go away with a bit of silicone oil, but other reviews range from "not a problem at all" to "nasty-feeling deal breaker" so I suspect that Kensington's quality control could use a bit of tightening up. Again, get one with a return policy in case you don't like it. Common sense. I find myself using the scroll wheel less than I would otherwise anyway, as I've mapped one of the buttons to middle-click and I use that in web browsers to scroll up and down by moving the cursor. Smoother and easier than the scroll wheel. :: Occasionally, a button click won't register if you press the button on the corner or edge - you have to get closer to the middle. Rarely an issue unless I'm gaming, because my hands have a large span and I may physically miss the button at a critical moment when I'm not paying attention. It'll come with practice, I'm sure, just something to be aware of if you have palm-a-basketball-sized hands like me. Now, to the pros! Whee! :: Yes, it's got a pretty big footprint - it's about 5.5" by 9" with the included stiff-foam wrist rest (which I do recommend using, because of the aforementioned back angle) - but it doesn't move around. It takes up about 60% of the desk space that you'd dedicate to a typical mouse pad. Especially on those pull-out keyboard trays, there isn't enough room to use a mouse, but since the Kensington Expert trackball is under six inches wide it'll fit in a nice little rectangle next to the keyboard. Height is another matter, since the ball itself sticks out pretty high, but I don't personally find it to be too much of an issue. YMMV. :: The four large, programmable buttons. I'm not a lefty, but I mouse left-handed, so being able to map the buttons to essentially whatever I want with Kensington's free software is absolutely a blessing. In addition, different people will prefer to use different fingers for tasks of varying frequency, so whereas I don't right-click much and map it to where my ring finger sits, someone else may put it under their index finger or thumb. The software in general is pretty easy to use, and has enough functionality to feel nicely customizable without being so in-depth that only an advanced power user can take advantage of its potential. :: The trackball. Oh, that trackball. Smoother than a greased Fonzie on a Teflon-coated ice rink. Right out of the package it actually feels slightly rough or not as free-spinning, because the ball and its three contact points are completely pristine. Once you get some skin oils on it through use, it's like buttah. Gross-sounding, I know, but pretty much everything you touch gets skin oil on it. Speaking of which, the ball is just dropped into its socket, so to clean out the inevitable gunk that will accumulate in any trackball assembly you just have to turn it upside down and the ball falls out. No disassembly required. The inside of the socket is smooth plastic, so you just wipe it out and get back to work. The ball itself has a nice bit of weight to it, and is positively pleasurable to the hands in use. It's got a solid feel and has some inertia when you move it, which brings me to the next point... :: It has an infinite range of very smooth motion. I currently have a dual-monitor setup, and (besides being very awkward and un-ergonomic) I despise having to pick up a mouse, move it back to the other side of my mouse pad and continue my motion across the screen. DESPISSSSSE. It makes my fingers recoil just thinking about it... Ahem. Anyways. A quick flick of the ball will send the cursor moving across the screen, and the ball's inertia will continue the motion. It doesn't jump around or go crazy, it just follows the ball like it's supposed to. I have the acceleration parameter in the software set to maximum, so a fast motion of the ball will cover lots of ground quickly, but slow motions will still allow fine, precise positioning of the mouse. This becomes an even greater blessing with triple- or quad-monitor setups, and once again, this trackball takes up less desk space than an ordinary mouse. You don't have to have a huge screen to need this, either... for extra-fine work like Photoshop or video editing, you may want to slow the cursor speed down, which effectively makes the screen much larger relative to the motion of the mouse. There is no picking up and putting down with the Kensington Expert trackball - you just keep rolling. If you're not there yet... keep rolling. It feels natural, the way navigating a computer should. So, to sum it all up, I guess I could say that I love my Kensington Expert Mouse because it feels right. It's intuitive to use, customizable, ergonomic, and it just works. There are a couple little niggles, but in my humble opinion they are far outweighed by how they make my computing experience easier and more natural. Because everyone has different needs for their computing experience, not everyone will want or need one of these. If I was just an occasional casual computer user that isn't concerned with ergonomics or ease of use, I would absolutely think twice about spending $75 on a mouse I'm not sure I'll like when the one I have mostly does what I need it to. But that's probably not Kensington's primary market here. For me, and people like me, it's worth the money to make my interface with my computer feel good, because I use it every day.
Review: Best trackball I've ever found, period - UPDATE: MAY 2017 I continue to LOVE this trackball. It's smooth, functional and lets me do everything I need in my graphic design/marketing studio. Of the 4 in the shop, one has developed some gravelly sound in the scroll ring and so it will need to be replaced, but the others are all working just fine years after purchase. I've used every version of this 4-button trackball since 1989, and it's been universally wonderful. Disregard the drama queens to who bitch about this product. They either got a defective unit or messed it up themselves, because I've had 29 years of personal experience that proves that Kensington has a SUPERIOR product in this trackball. NOTE TO ANYONE WHOSE TRACKBALL ISN'T WORKING PROPERLY: You have a defective unit! Tell desertcart or Kensington about it and arrange to have them send you a replacement unit. In any run of mass-produced products you'll always get a small few that are defective. Call customer support and get it replaced. UPDATE: OCT/2016: I LOVE this trackball (even though they call it the Expert Mouse). I've used my current model for over 4 years without a single problem. It's fast and does not stress my wrist at all because I control it with my fingers. Every couple of months I take the ball out and turn the unit upside down to dump out any dust and hair that have accumulated in the ball cavity. It's a good idea to take a tissue and gently wipe off the 3 sensor points so they're not clogged with dirt and skin oils. Maintenance is a snap. If your hands/fingers are really oily you might have to occasionally take out the ball and wash it with soap and water, but that's about it. I work for 8-10 hours every single day at my computer with Photoshop, InDesign, Illustrator and Muse (all from Adobe Systems) and it lets me be very fast. I set the Trackballworks software so that the cursor flies around the screen with the flick of my fingers. I simply wouldn't work without it. The big ball rolls easily and is essential to my workflow.; DEC 1/2014: The Kensington Expert Mouse is actually not a mouse at all, but a trackball that is well-made and very durable. I've used Kensington's Turbo Mouse, an earlier version of this product, starting in 1989 and its various iterations ever since. It connects via USB 2 to either Mac or Windows, and replaces the standard mouse that comes with your computer. Software drivers for Mac and Windows are available on Kensington's site. Why should you replace your mouse with this product? The Expert Mouse has a large ball about the size of a pool ball that you move with your fingertips. You can rocket the cursor quickly to any part of your monitor with a simple flick of your fingers, instead of having to move your whole arm with a regular mouse. I often work 8-10 hours a day at my computer and a 30" monitor doing graphic design work, and the Expert Mouse prevents stress on my arm and hand. For right handers, left-clicking is done with your thumb on the lower left button. Right-clicking is done with your little finger on the lower right button. However, you can program any of the 4 buttons to do any of these two actions, and custom-program other actions with the remaining 2 buttons. Speaking frankly, I LOVE this trackball, as it keeps me productive and speeds my work immensely. New users may notice the ball may move a tad sluggishly when they first unpack the trackball, but this quickly goes away with a few minutes of use. The speed of the cursor can be easily adjusted with the supplied driver/software to your liking. The trackball takes up very little desk room. It's only 5" x 6" and no mouse pad is required. Around the ball is a scroll ring that allows you to quickly scroll around your documents and web pages in a flash. I could never go back to a mouse. The Kensington Expert Mouse is absolutely the best trackball product I've ever used, and I've been using it or its direct ancestors for 23 years! It may take a day or two to get used to it, but when you do you'll never want to use a regular mouse again. It's really that good. Cleaning is easy. I recommend that about once a month that you simply pick up the unit, hold your hand over the ball and turn it over. The ball will fall into your hand. Tap gently on the bottom of the unit to release dust, food particles, hair, dead skin cells and other gunk that's built up. You may have to use a tissue to wipe out the ball cavity and polish up the ball itself to remove any grime or skin oils from your hand. You can even wash the ball in mild, soapy water if you have excessively oily fingers. It's advisable to use a tissue to remove the gunk that builds up over the 3 tiny balls inside the ball cavity, as these can build up with dirt, fuzz and grime over time. It usually takes only a few seconds to do this every month or so, so it's not a bother. Your trackball should last you for many years of lightning-fast, smooth cursor action if you do this. My current Expert Mouse is over 5 years old and going strong, without a single problem in that time. UPDATE: JUNE 10, 2013 These trackballs last a LONG time! I'm buying a new Kensington Expert Mouse to replace one I bought over 4 years ago. I must have had something on my fingers that has caused the scroll ring rubber to start breaking down and get sticky (possibly bug spray). I'm putting in my order for a new Expert Mouse in the exact same model because it's the best computer trackball I've ever used--and I've been using the various versions of this product since 1990! There's just no other trackball that works as well and is so durable. I use mine with a Mac Pro at work and an iMac at home, and sometimes even take it along on the road to use on my MacBook Pro 17" when I travel. Simply the best! I give it another 5 stars.

## Features

- Large 55mm ball design and Diamond Eye optical tracking for precise cursor control; Patented scroll ring lets you scan up and down pages with ease
- Detachable, ergonomic wrist rest supports hand and wrist for improved comfort; Ambidextrous design
- Customizable 4-button design, scroll speed and cursor speed via *KensingtonKonnect software. *Windows ARM-based computers are currently not supported. Please check back for future updates on compatibility
- ChromeOS user can get HID functions for a trackball but will not be able to customize their device through KensingtonKonnect.
- Wired USB-A connection for reliable connectivity

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00009KH63 |
| Additional Features | Ergonomic Design |
| Antenna Location | Office |
| Are Batteries Included | Yes |
| Are Batteries Required | Yes |
| Best Sellers Rank | #2 in Computer Trackballs |
| Brand | Kensington |
| Built-In Media | Detachable Wrist Rest, Kensington Trackball 4-Button Usb Expert Mouse |
| Button Quantity | 3 |
| Color | Black Silver |
| Compatible Devices | Surface Laptop 1st Edition 13", Windows 7, Windows 8, Windows 8.1, macOS 10.8, Windows 10, macOS X 10.11, macOS 10.10 or above, Chrome OS 44 or above, macOS 10.9, macOS Sierra 10.12, macOS 10.13 or above |
| Connectivity Technology | USB |
| Customer Reviews | 4.3 4.3 out of 5 stars (4,435) |
| Embellishment Feature | Crystal |
| Enclosure Material | Plastic |
| Finish | Matte |
| Global Trade Identification Number | 00085896643258, 50085896643253 |
| Hand Orientation | Ambidextrous |
| Hardware Platform | PC |
| Item Dimensions L x W | 9.75"L x 3.5"W |
| Item Part Number | 64325 |
| Item Weight | 0.34 Kilograms |
| Manufacturer | Kensington |
| Mfr Part Number | 64325 |
| Minimum Required Operating System Version | Windows 7 |
| Model Name | K64325 |
| Model Number | 64325 |
| Movement Detection | Optical |
| Number of Batteries | 1 12V batteries required. (included) |
| Operating System | Windows 10, Windows 7 |
| Pattern | Mouse |
| Power Source | Corded Electric |
| Range | feet |
| Style Name | Wired |
| UPC | 638458744902 085896643258 809385141014 666669843022 803982736673 |
| Unit Count | 1.0 Count |
| Warranty Description | 5 Year Warranty |

## Product Details

- **Brand:** Kensington
- **Color:** Black Silver
- **Connectivity Technology:** USB
- **Movement Detection Technology:** Optical
- **Special Feature:** Ergonomic Design

## Images

![Expert - Image 1](https://m.media-amazon.com/images/I/51-OPm54iKL.jpg)
![Expert - Image 2](https://m.media-amazon.com/images/I/71VEXYlsNML.jpg)
![Expert - Image 3](https://m.media-amazon.com/images/I/71ytB6AAY8L.jpg)
![Expert - Image 4](https://m.media-amazon.com/images/I/61uJ+jSB+jL.jpg)
![Expert - Image 5](https://m.media-amazon.com/images/I/71SUOaNWV1L.jpg)

## Available Options

This product comes in different **Pattern, Style** options.

## Questions & Answers

**Q: Does it work on Linux?**
A: Yes. I’ve used this trackball with 5 different releases of Linux Mint going back some years. All 4 buttons will work, but you will have to monkey with your desktop environment to map them to what you want.

**Q: does left click result in double click after use?**
A: I have a Kensington "Mouse Port/Serial" version (RS232 "COM" Serial or PS/2) Expert Mouse trackball (from the mid 90's) that I bought new all those years ago when I built my Intel 486 DX2-66 PC (66Mhz = 0.066Ghz) and have been using for hours and hours every day on each PC upgrade I've built ever since (currently a i7-4790K !), including audio editing, gaming, web browsing, and more...  I still have the original box which says "OS2 Warp" and "Works with Windows 95 and Windows 3.1" and "5 Year Warranty" on it (yes, it's really THAT old!) and all these years later I'm now using it on a 4.0Ghz quad-core PC running Windows 10 Pro x64 with no problems whatsoever! Even after pounding hard on the bottom left button for gaming year after year it just took the abuse and kept on working fine. After about 15 years of that abuse along with lots of hard pressure holding of that same bottom left button for selecting audio segments, manually scrolling through documents and web pages, and so on, it began occasionally either releasing or double-clicking during selecting of audio segments as if I'd released the button when I had not, BUT after sitting overnight it always goes back to normal and doesn't act up like that unless I start doing lots of heavy thumb action with bottom left button holding or pounding again. If I remember to go a little easier on the pressing or don't do a ton of left button holds it can go for weeks before the bottom left button gets quirky again. Also note that it's literally 20 years old, it's been doing that off and on for about a decade now, and it has never been anywhere near as intermittent and downright useless as the Logitech buttons become in less than a year with comparable use. We have Logitech trackballs at work and after the third replacement batch in 2 years they've learned to live with the flaky buttons because the boss feels that $25-$40 for a mouse is absurd and he definitely won't spend the money to buy Kensington trackballs... I'm actually about to replace my 20 year old Kensington Expert Mouse with the new model, only because I need a KVM, my back-lit keyboard is "USB only" (PS/2 Support), USB didn't exist when I bought my now 20 year old Serial/PS-2 Expert Mouse, and although I have successfully gotten its' signals to convert to USB through a (RS-232 COM Port) "Serial to USB interface" and also got a PS/2 to USB keyboard/mouse signal converter dongle to work with it I haven't been able to successfully get either of those converted USB signals to pass through a USB KVM...I started to look for other ways to adapt PS/2 or Serial to USB that claimed to be KVM compatible but I couldn't find a workable solution that would pass through a USB KVM for less than the cost of a brand new Kensington USB Expert Mouse so sadly I think my 20 year old Expert Mouse is about to be retired and an new USB one will finally be taking its' place soon. I hope the quality of today's Kensington Expert Mouse is as good as they were 20 years ago. Time will tell... Also note that my 20 year old Expert Mouse that still works very well uses 2 giant wide metal rollers for the X and Y axis motion detection (that the ball rests on) with photo-led sensor wheels inside to generate the X/Y mouse movement signals, basically over-sized industrial grade versions of the small plastic roller rods the old rubber ball mice used to use (which had to be cleaned when the cursor started getting stuck and I need to clean these maybe once every 3-4 years at the most), unlike the much newer mouse technology of the past decade that uses optical detectors to actually look at the ball and see it move. As a comparison, Logitech once offered a big track ball mouse for a while that looked almost identical to the Kensington Expert Mouse for less than half the price and when I lifted the ball out to check out the rollers it was immediately obvious why the price was so much less.  They were tiny rollers just like you'd find inside a cheap old ball mouse! So 20 years ago you got what you paid for, and even 10 years ago it was obvious that the Kensington products were still vastly superior in quality to their competition and based on the reviews here that still seems to be the case.

**Q: Can the Expert side scroll?  I use spreadsheets that are really wide and have a lot of columns and need that feature.**
A: Even better than holding the SHIFT key, you can scroll horizontally ONE-HANDED: Assign one of the additional buttons to activate the SHIFT key using the included KENSINGTON TRACKBALL WORKS software. I recommend using the button opposite your thumb so you can use your thumb to scroll horizontally. So, for those RIGHT-handed assign SHIFT to the TOP RIGHT button, for LEFT-handed assign SHIFT to the TOP LEFT button. This works on Windows and Mac OS X.More Info: http://www.kensington.com/us/us/6498/trackballworks%e2%84%a2-customization-software

**Q: Does the scroll ring on this mouse have clicks that you can feel while scrolling - when scrolling through a set of images to be able to know that you**
A: No, I don't know if the people above had a different version of the mouse or something but there are NO clicks on the scroll ring. It scrolls smoothly.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Computer navigation the way it should be!
*by J***S on January 31, 2014*

After having read several reviews around the web and being aware of the potential downsides as well as the upsides, I decided to buy myself one of these. Boy, am I glad I did. Admittedly, I'm the kind of person who's not satisfied with the typical mousing solution (I have really big hands and I do a lot of delicate work) and likes to try new things, so if that's not you then you may want to try one out before you buy if possible, or at least get one with a return policy. Caveat emptor. That being said, short of building a custom one myself, the Kensington Expert Mouse is pretty much what I want in a trackball, and having used it for awhile any regular mouse feels foreign and less-than-intuitive. First, the cons, in order of greatest to least issue (and they're all minor issues to me anyway). :: It does have a bit of a backward slope to it, probably about 10-15 degrees, which my large hands and already-tilted desk find mildly awkward. If you have a desk that's fairly high above your lap, then that backward slant will probably match the angle your arms are already at and this won't be an issue. :: The scroll wheel, as has been mentioned elsewhere, does feel a little scratchy, like a plastic-on-plastic sort of texture. It's not quite the buttery-smooth, gliding motion you expect after using the ball itself (more on that later) - it feels more like the back of a plastic spoon sliding across a Formica counter. That said, mine wasn't that bad, and probably would go away with a bit of silicone oil, but other reviews range from "not a problem at all" to "nasty-feeling deal breaker" so I suspect that Kensington's quality control could use a bit of tightening up. Again, get one with a return policy in case you don't like it. Common sense. I find myself using the scroll wheel less than I would otherwise anyway, as I've mapped one of the buttons to middle-click and I use that in web browsers to scroll up and down by moving the cursor. Smoother and easier than the scroll wheel. :: Occasionally, a button click won't register if you press the button on the corner or edge - you have to get closer to the middle. Rarely an issue unless I'm gaming, because my hands have a large span and I may physically miss the button at a critical moment when I'm not paying attention. It'll come with practice, I'm sure, just something to be aware of if you have palm-a-basketball-sized hands like me. Now, to the pros! Whee! :: Yes, it's got a pretty big footprint - it's about 5.5" by 9" with the included stiff-foam wrist rest (which I do recommend using, because of the aforementioned back angle) - but it doesn't move around. It takes up about 60% of the desk space that you'd dedicate to a typical mouse pad. Especially on those pull-out keyboard trays, there isn't enough room to use a mouse, but since the Kensington Expert trackball is under six inches wide it'll fit in a nice little rectangle next to the keyboard. Height is another matter, since the ball itself sticks out pretty high, but I don't personally find it to be too much of an issue. YMMV. :: The four large, programmable buttons. I'm not a lefty, but I mouse left-handed, so being able to map the buttons to essentially whatever I want with Kensington's free software is absolutely a blessing. In addition, different people will prefer to use different fingers for tasks of varying frequency, so whereas I don't right-click much and map it to where my ring finger sits, someone else may put it under their index finger or thumb. The software in general is pretty easy to use, and has enough functionality to feel nicely customizable without being so in-depth that only an advanced power user can take advantage of its potential. :: The trackball. Oh, that trackball. Smoother than a greased Fonzie on a Teflon-coated ice rink. Right out of the package it actually feels slightly rough or not as free-spinning, because the ball and its three contact points are completely pristine. Once you get some skin oils on it through use, it's like buttah. Gross-sounding, I know, but pretty much everything you touch gets skin oil on it. Speaking of which, the ball is just dropped into its socket, so to clean out the inevitable gunk that will accumulate in any trackball assembly you just have to turn it upside down and the ball falls out. No disassembly required. The inside of the socket is smooth plastic, so you just wipe it out and get back to work. The ball itself has a nice bit of weight to it, and is positively pleasurable to the hands in use. It's got a solid feel and has some inertia when you move it, which brings me to the next point... :: It has an infinite range of very smooth motion. I currently have a dual-monitor setup, and (besides being very awkward and un-ergonomic) I despise having to pick up a mouse, move it back to the other side of my mouse pad and continue my motion across the screen. DESPISSSSSE. It makes my fingers recoil just thinking about it... Ahem. Anyways. A quick flick of the ball will send the cursor moving across the screen, and the ball's inertia will continue the motion. It doesn't jump around or go crazy, it just follows the ball like it's supposed to. I have the acceleration parameter in the software set to maximum, so a fast motion of the ball will cover lots of ground quickly, but slow motions will still allow fine, precise positioning of the mouse. This becomes an even greater blessing with triple- or quad-monitor setups, and once again, this trackball takes up less desk space than an ordinary mouse. You don't have to have a huge screen to need this, either... for extra-fine work like Photoshop or video editing, you may want to slow the cursor speed down, which effectively makes the screen much larger relative to the motion of the mouse. There is no picking up and putting down with the Kensington Expert trackball - you just keep rolling. If you're not there yet... keep rolling. It feels natural, the way navigating a computer should. So, to sum it all up, I guess I could say that I love my Kensington Expert Mouse because it feels right. It's intuitive to use, customizable, ergonomic, and it just works. There are a couple little niggles, but in my humble opinion they are far outweighed by how they make my computing experience easier and more natural. Because everyone has different needs for their computing experience, not everyone will want or need one of these. If I was just an occasional casual computer user that isn't concerned with ergonomics or ease of use, I would absolutely think twice about spending $75 on a mouse I'm not sure I'll like when the one I have mostly does what I need it to. But that's probably not Kensington's primary market here. For me, and people like me, it's worth the money to make my interface with my computer feel good, because I use it every day.

### ⭐⭐⭐⭐⭐ Best trackball I've ever found, period
*by L***S on December 1, 2011*

UPDATE: MAY 2017 I continue to LOVE this trackball. It's smooth, functional and lets me do everything I need in my graphic design/marketing studio. Of the 4 in the shop, one has developed some gravelly sound in the scroll ring and so it will need to be replaced, but the others are all working just fine years after purchase. I've used every version of this 4-button trackball since 1989, and it's been universally wonderful. Disregard the drama queens to who bitch about this product. They either got a defective unit or messed it up themselves, because I've had 29 years of personal experience that proves that Kensington has a SUPERIOR product in this trackball. NOTE TO ANYONE WHOSE TRACKBALL ISN'T WORKING PROPERLY: You have a defective unit! Tell Amazon or Kensington about it and arrange to have them send you a replacement unit. In any run of mass-produced products you'll always get a small few that are defective. Call customer support and get it replaced. UPDATE: OCT/2016: I LOVE this trackball (even though they call it the Expert Mouse). I've used my current model for over 4 years without a single problem. It's fast and does not stress my wrist at all because I control it with my fingers. Every couple of months I take the ball out and turn the unit upside down to dump out any dust and hair that have accumulated in the ball cavity. It's a good idea to take a tissue and gently wipe off the 3 sensor points so they're not clogged with dirt and skin oils. Maintenance is a snap. If your hands/fingers are really oily you might have to occasionally take out the ball and wash it with soap and water, but that's about it. I work for 8-10 hours every single day at my computer with Photoshop, InDesign, Illustrator and Muse (all from Adobe Systems) and it lets me be very fast. I set the Trackballworks software so that the cursor flies around the screen with the flick of my fingers. I simply wouldn't work without it. The big ball rolls easily and is essential to my workflow.; DEC 1/2014: The Kensington Expert Mouse is actually not a mouse at all, but a trackball that is well-made and very durable. I've used Kensington's Turbo Mouse, an earlier version of this product, starting in 1989 and its various iterations ever since. It connects via USB 2 to either Mac or Windows, and replaces the standard mouse that comes with your computer. Software drivers for Mac and Windows are available on Kensington's site. Why should you replace your mouse with this product? The Expert Mouse has a large ball about the size of a pool ball that you move with your fingertips. You can rocket the cursor quickly to any part of your monitor with a simple flick of your fingers, instead of having to move your whole arm with a regular mouse. I often work 8-10 hours a day at my computer and a 30" monitor doing graphic design work, and the Expert Mouse prevents stress on my arm and hand. For right handers, left-clicking is done with your thumb on the lower left button. Right-clicking is done with your little finger on the lower right button. However, you can program any of the 4 buttons to do any of these two actions, and custom-program other actions with the remaining 2 buttons. Speaking frankly, I LOVE this trackball, as it keeps me productive and speeds my work immensely. New users may notice the ball may move a tad sluggishly when they first unpack the trackball, but this quickly goes away with a few minutes of use. The speed of the cursor can be easily adjusted with the supplied driver/software to your liking. The trackball takes up very little desk room. It's only 5" x 6" and no mouse pad is required. Around the ball is a scroll ring that allows you to quickly scroll around your documents and web pages in a flash. I could never go back to a mouse. The Kensington Expert Mouse is absolutely the best trackball product I've ever used, and I've been using it or its direct ancestors for 23 years! It may take a day or two to get used to it, but when you do you'll never want to use a regular mouse again. It's really that good. Cleaning is easy. I recommend that about once a month that you simply pick up the unit, hold your hand over the ball and turn it over. The ball will fall into your hand. Tap gently on the bottom of the unit to release dust, food particles, hair, dead skin cells and other gunk that's built up. You may have to use a tissue to wipe out the ball cavity and polish up the ball itself to remove any grime or skin oils from your hand. You can even wash the ball in mild, soapy water if you have excessively oily fingers. It's advisable to use a tissue to remove the gunk that builds up over the 3 tiny balls inside the ball cavity, as these can build up with dirt, fuzz and grime over time. It usually takes only a few seconds to do this every month or so, so it's not a bother. Your trackball should last you for many years of lightning-fast, smooth cursor action if you do this. My current Expert Mouse is over 5 years old and going strong, without a single problem in that time. UPDATE: JUNE 10, 2013 These trackballs last a LONG time! I'm buying a new Kensington Expert Mouse to replace one I bought over 4 years ago. I must have had something on my fingers that has caused the scroll ring rubber to start breaking down and get sticky (possibly bug spray). I'm putting in my order for a new Expert Mouse in the exact same model because it's the best computer trackball I've ever used--and I've been using the various versions of this product since 1990! There's just no other trackball that works as well and is so durable. I use mine with a Mac Pro at work and an iMac at home, and sometimes even take it along on the road to use on my MacBook Pro 17" when I travel. Simply the best! I give it another 5 stars.

### ⭐⭐⭐⭐⭐ Review
*by M***Y on April 21, 2015*

This product has found its home in almost every professional recording studio in the world. It is extremely dextrous and such a comfort to the wrist. Long hours at the studio don't seem so long anymore! The only issue I have noticed is with the scroll wheel not performing smoothly, but it still works. The trackball is weighted and has sufficient momentum to sen e cursor flying to the other end of the wide screen display. Integrates very well with Pro Tools, and general workflow. I am yet to try out the customisable top keys to instantiate macros. Very satisfied with the product finish and quality.

## Frequently Bought Together

- Kensington Expert Trackball Mouse (K64325), Black Silver, 5"W x 5-3/4"D x 2-1/2"H
- Kensington Orbit Trackball Mouse with Scroll Ring (K75327WW), Black-Grey
- Kensington Pro Fit Ergonomic Wired Keyboard- Black (K75400US)

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