---
product_id: 263333438
title: "Water Leak Sensor 2, 105 dB Alarm, YS7904G"
brand: "yolink"
price: "R1048"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Yo Link"
url: https://www.desertcart.co.za/products/263333438-water-leak-sensor-2-105-db-alarm-ys7904g
store_origin: ZA
region: South Africa
---

# 1/4 mile LoRa range 2+ year battery life 105dB built-in siren Water Leak Sensor 2, 105 dB Alarm, YS7904G

**Brand:** yolink
**Price:** R1048
**Availability:** ✅ In Stock

## Summary

> 🚨 Stay dry, stay smart—leak detection that never sleeps!

## Quick Answers

- **What is this?** Water Leak Sensor 2, 105 dB Alarm, YS7904G by yolink
- **How much does it cost?** R1048 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/263333438-water-leak-sensor-2-105-db-alarm-ys7904g)

## Best For

- yolink enthusiasts

## Why This Product

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

## Key Features

- • **Power Outage Proof:** Device-to-device pairing keeps sensors live even when WiFi, internet, or power fail—reliable 24/7 peace of mind.
- • **Plug & Play Smart Setup:** Scan & Play QR code app integration makes installation a breeze—no electrician needed, no outlet required.
- • **Customizable Sensing Zones:** 4.2 ft rope-style sensor cable with extendable options for precise leak detection in tight or critical spots.
- • **Unmatched Long-Range Detection:** LoRa wireless tech covers up to 1/4 mile—protect every corner of your property effortlessly.
- • **Seamless Smart Home Integration:** Works with Alexa & IFTTT for instant alerts and automation—stay connected and in control anywhere.

## Overview

The YoLink Water Leak Sensor 2 offers industry-leading 1/4 mile LoRa wireless range and a powerful 105dB siren to detect leaks early and loud. With a 2+ year battery life and patented device-to-device pairing, it remains fully operational even during WiFi or power outages. Its extendable 4.2 ft rope-style sensor cable allows precise placement in confined spaces, while easy QR code setup and Alexa/IFTTT compatibility make it a must-have for proactive smart home water protection.

## Description

YoLink Water Leak Sensor 2,1/4 Mile World's Longest Range Smart Home Water Leak Sensor,Water Leak Detector with Built-in Siren Up to 105dB,Works with Alexa and IFTTT-YoLink Hub Required,YS7904-UC: desertcart.com: Industrial & Scientific

Review: Water Level Sensor is an elegant method for monitoring my sump pumps - I've been a little paranoid about my sump pump recently. I have three pumps in my sump well, a primary pump with its built-in vertical float sensor, a secondary backup pump with a vertical float sensor positioned so that it will not activate unless the primary pump stops working, and a 12-volt pump that runs off a 100 amp-hour AGM battery kept charged using a battery tender. This 12-volt sump pump is my pump of last resort in case of a power outage, and its float will not activate unless the sump water level gets above both the primary and secondary pumps. With this setup, it's not easy to tell when my primary sump pump stops working. This YoLInk Water Leak Sensor 3 solves this problem. The sensor comes with a water sensor probe, which I did not use. For sump wells, they suggest that you use a float switch instead of the included probe since the probe terminals could become covered with mineral deposits and reduce their water detection sensitivity. I ordered the 'Level Sense 15 Feet Water Level Float Switch with Mounting Bracket' from desertcart and it works perfectly for this sump well application. I just had to wire in a standard 3.5mm male plug to the end of the float switch wires to be able to plug into the YoLInk Water Leak Sensor. The YoLink Water Leak Sensor requires the use of an inexpensive central hub (I bought the YoLInk SpeakerHub). It communicates with the hub by use of a long-range radio that has up to a 1/4 mile range and uses very little power. The two standard AA batteries in the Water Leak Sensor should last for one to two years. Setup was quick and easy. You just install the YoLink App onto your cell phone, plug in the hub anywhere in your house, and connect it to your home WiFi. Then you can easily add the Water Leak Sensor to your system by scanning the QR code on the sensor. The YoLink ecosystem has many different types of sensors, alarm speakers, switches, etc. for constructing very elaborate home automation systems. This Water Leak Sensor is a good introduction to this ecosystem, and I'll certainly be considering other home automation options. I attached the small Water Level Float Switch in my sump well so that it would not activate unless the sump water level rose above the normal maximum level permitted by my primary sump pump (but below the level where my secondary sump pump would activate). Now, if my primary sump pump stops working, I receive both an email alert as well as an app notification on my cell phone letting me know that the primary sump pump has stopped working. You can also set up the app to text you an alert, which I have not yet done since you are limited to 25 free SMS texts per month. Since the YoLInk system is compatible with Alexa, I also have all my Alexa devices announce that my primary sump pump has stopped working (easily done with an Alexa routine). In addition, I have set up my YoLInk system to notify me when the float switch opens back up, since this tells me that my secondary pump has run successfully, giving me peace of mind. The YoLInk Water Level Sensor is an elegant method by which to monitor my sump pumps. Now, no matter where I am, I'll know if my primary pump has failed and needs attention as well as whether my secondary backup pump has successfully run. I'm also impressed with the entire YoLInk ecosystem.
Review: Easy Set Up and Reliable - Easy set up and stays online unlike my previous Flo sensors. The leak detection is VERY sensitive. It detected a small amount of rain that was coming in by the water heater vent, wasn’t causing a problem but previous sensors didn’t catch. It’s takes awhile for the sensor cord to dry so it can be reconnected. We just got an extra cord to plug in while it’s drying.

## Features

- STATE-OF-THE-ART Smart Water Leak Detection: LoRa-based 1/4 mile open-air range, 2+ year battery life, no dependence on WiFi, device-to-device pairing provides functionality even with the loss of AC and/or internet!
- ROPE STYLE water-sensing cable, 4.2 feet (1.2 meter) long, additional cables can be added, for detection in confined spaces, such as under a dishwasher, and for defining specific detection areas, such as encircling a water heater
- THAT WAS EASY! Installs quickly and easily, thanks to Scan & Play QR-code scanner feature in the app, easy wall-mounting, and no requirement to plug the sensor into an AC outlet.
- NO WIFI, NO INTERNET, NO POWER? NO PROBLEM! Our patented Control-D2D device-to-device pairing, over our LoRa-based wireless network, allows for devices to be paired to each other, in such a way they will continue to operate, even if WiFi is flaky, the internet goes down, or the AC power goes out!
- A YoLink hub is REQUIRED! This device will not operate without a Hub, not included. Please search for B09FSS95G9 for a SpeakerHub (our audio, talking hub) or B07TQLKQLJ for the original Hub

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08P1WD66X |
| Best Sellers Rank | #11,075 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #14 in Water Detectors & Alarms |
| Brand | YoLink |
| Brand Name | YoLink |
| Customer Reviews | 4.5 out of 5 stars 943 Reviews |
| Item Dimensions | 3.27 x 0.59 x 1.22 inches |
| Item dimensions L x W x H | 3.27 x 0.59 x 1.22 inches |
| Manufacturer | YOSMART |
| Material | Plastic |
| Material Type | Plastic |
| Maximum Supply Voltage | 3 volts_of_direct_current |
| Measuring Range | 32°F - 122°F |
| Model | YS7904-UC |
| Mounting Type | Wall Mount |
| Number of Items | 1 |
| Output Type | Digital |
| Part Number | YS7904-UC |
| Sensing Distance | 0.25 miles |
| Specific Uses For Product | Amateur, Inside, Professional |
| Style | Without Hub |
| Style Name | Without Hub |
| UPC | 850024791091 |
| Unit Count | 1 Count |
| Upper Temperature Rating | 122 °F |
| Warranty Description | 2 Years |

## Product Details

- **Brand:** YoLink
- **Item dimensions L x W x H:** 3.27 x 0.59 x 1.22 inches
- **Material:** Plastic
- **Maximum Supply Voltage:** 3 volts_of_direct_current
- **Style:** Without Hub

## Images

![Water Leak Sensor 2, 105 dB Alarm, YS7904G - Image 1](https://m.media-amazon.com/images/I/51xkkGlZDWL.jpg)

## Available Options

This product comes in different **Set name** options.

## Questions & Answers

**Q: Does the entire cable detect water or just the tip on the end?**
A: The sensor cable of the YoLink Water Leak Sensor 2 detects water along the length of the cable. For more information, please kindly refer to the following guide http://www.yosmart.com/support/YS7904-UC/docs/instruction

**Q: I plan to submerge v3 type of the sensor in the sump pump. I wonder if the "dirty" water will corrode/damage the sensor?**
A: It is possible for the probe cable to get a build-up that can slow the response time, particularly slow drying (as the gunk on it might hold moisture). For this application, I recommend wiring our sensor to a float switch. It will work great, even in a dirty water environment. 

We do not suggest any particular model. Most of them are interchangeable by flipping the float around 180° but you want one that has closed contacts when in the water-detected/high position, for it to give you a "water detected" indication on the app. It is possible to work with the opposite (open) and get the desired response and notifications in automation settings but the app will display it as no-water when you have water at the float. 

Eric with YoSmart

**Q: How many sensors can i "pair" with one hub? i have 3 basements that i need to monitor. or do i need a hub for each sensor?**
A: 128 pairs!

You will need a hub at each building, but unless you have a very large building, or a lot of RF obstructions, you should be fine with just one hub. 

Eric with YoSmart

**Q: Will laying this cable on a conducting metal surface trigger the alarm? I.e. inside a water heater pan?**
A: No, the metal will not impact its operation. Do keep in mind, the sensor body should not get wet. That has to stay outside the pan. You might consider instead our Water Leak Sensor 1. You can look at customer-submitted photos and find several instances of this sensor being placed in a water heater or air conditioner pan. 

https://www.amazon.com/dp/B07Z7QWJBP?ref=myi_title_dp&th=1

## Customer Reviews

### ⭐⭐⭐⭐⭐ Water Level Sensor is an elegant method for monitoring my sump pumps
*by D***E on February 28, 2023*

I've been a little paranoid about my sump pump recently. I have three pumps in my sump well, a primary pump with its built-in vertical float sensor, a secondary backup pump with a vertical float sensor positioned so that it will not activate unless the primary pump stops working, and a 12-volt pump that runs off a 100 amp-hour AGM battery kept charged using a battery tender. This 12-volt sump pump is my pump of last resort in case of a power outage, and its float will not activate unless the sump water level gets above both the primary and secondary pumps. With this setup, it's not easy to tell when my primary sump pump stops working. This YoLInk Water Leak Sensor 3 solves this problem. The sensor comes with a water sensor probe, which I did not use. For sump wells, they suggest that you use a float switch instead of the included probe since the probe terminals could become covered with mineral deposits and reduce their water detection sensitivity. I ordered the 'Level Sense 15 Feet Water Level Float Switch with Mounting Bracket' from Amazon and it works perfectly for this sump well application. I just had to wire in a standard 3.5mm male plug to the end of the float switch wires to be able to plug into the YoLInk Water Leak Sensor. The YoLink Water Leak Sensor requires the use of an inexpensive central hub (I bought the YoLInk SpeakerHub). It communicates with the hub by use of a long-range radio that has up to a 1/4 mile range and uses very little power. The two standard AA batteries in the Water Leak Sensor should last for one to two years. Setup was quick and easy. You just install the YoLink App onto your cell phone, plug in the hub anywhere in your house, and connect it to your home WiFi. Then you can easily add the Water Leak Sensor to your system by scanning the QR code on the sensor. The YoLink ecosystem has many different types of sensors, alarm speakers, switches, etc. for constructing very elaborate home automation systems. This Water Leak Sensor is a good introduction to this ecosystem, and I'll certainly be considering other home automation options. I attached the small Water Level Float Switch in my sump well so that it would not activate unless the sump water level rose above the normal maximum level permitted by my primary sump pump (but below the level where my secondary sump pump would activate). Now, if my primary sump pump stops working, I receive both an email alert as well as an app notification on my cell phone letting me know that the primary sump pump has stopped working. You can also set up the app to text you an alert, which I have not yet done since you are limited to 25 free SMS texts per month. Since the YoLInk system is compatible with Alexa, I also have all my Alexa devices announce that my primary sump pump has stopped working (easily done with an Alexa routine). In addition, I have set up my YoLInk system to notify me when the float switch opens back up, since this tells me that my secondary pump has run successfully, giving me peace of mind. The YoLInk Water Level Sensor is an elegant method by which to monitor my sump pumps. Now, no matter where I am, I'll know if my primary pump has failed and needs attention as well as whether my secondary backup pump has successfully run. I'm also impressed with the entire YoLInk ecosystem.

### ⭐⭐⭐⭐⭐ Easy Set Up and Reliable
*by L***S on July 27, 2026*

Easy set up and stays online unlike my previous Flo sensors. The leak detection is VERY sensitive. It detected a small amount of rain that was coming in by the water heater vent, wasn’t causing a problem but previous sensors didn’t catch. It’s takes awhile for the sensor cord to dry so it can be reconnected. We just got an extra cord to plug in while it’s drying.

### ⭐⭐⭐⭐⭐ May or may not perform depending on our application.
*by P***B on September 26, 2024*

First, it’s important to know this is just the same “Water Sensor 2” sensor as YoLink’s rope-style water leak sensor and their remote cable style water leak sensor. During setup, it gets configured as their remote cable sensor, but the alerts are simply inverted, so that it alerts when “dry” rather than “wet”. Where this is important is in how the sensor communicates and behaves. Because the sensor is, at its core, a leak sensor, it tends to get very chatty if the body of water you are monitoring for level with this sensor has any chop, as in, say, a swimming pool (even one that’s not actively in use.) I didn’t mind this, as I turned off the alerts and was simply intending to use this with a Home Assistant automation to selectively trigger and stop an auto-pool-refill function. However, it seems like this extreme chattiness may be having other adverse consequences in how the device interacts with YoLink’s platform. I don’t have confirmation yet, but I suspect my device’s updates are being rate-limited by the upstream servers. This unfortunately results in the sensor becoming “stuck” in either the wet or dry reading, regardless of what the sensor’s float switch position actually is. And when the rate limiting (or whatever the problem is) finally resolves, if the float switch doesn’t again cross over the trigger point, the sensor will remain in whatever erroneous position. This has caused me to overfill my pool a couple times as I did not realize the issue was occurring. So, if you have a glass-smooth water surface, such as in a closed reservoir or a small indoor aquarium, where the float switch is reliably either on or off, this may work for you. But for anything where the sensor may tend to cross back and forth over the trigger point cintinuously, such as with any sort of automations, this may not be the best solution. I am currently in the process of working with YoLink support on the issues I’m having, and I will update this review with the results. To their credit, they are extremely helpful. Already they have sent me a replacement sensor to see if that would correct the issue (but it did not). I am now awaiting their next response after giving them detailed feedback. Update: within a week of my previous review, YoLink support informed me of a new updated firmware they had available that would allow a delayed reporting interval for water level alerts. In the computer programming world, you might call this a “debounce” capability. With this firmware update, I can specify how long the sensor must continuously register a water exhausted warning internally before reporting it in an upstream alert to the servers. After applying this update, and some back and forth with support regarding some behaviors that still seemed to not be quite right, I can now say it seems that the sensor is performing as intended for my needs in monitoring the water level in my outdoor swimming pool. I am of course still closely monitoring it to make sure it doesn’t overfill my pool again, but I am cautiously optimistic that YoLink has, with this update, corrected the issue I was having. I am really impressed with Yolink’s responsiveness and willingness to help me find solutions here. I don’t know if the minor firmware update they made available is something they had in the works already, or something they added at my request, as it was very much aligned to a suggestion I made that might alleviate the issue. Either way, it was rolled out seemingly in response to my troubles in a very short order. Kudos to them! I am raising my review rating to five stars (previously 3 stars) for now. Assuming the sensor continues to perform as it is now, the 5 star rating will be deserved. If not, I will return again with an update.

## Frequently Bought Together

- YoLink Water Leak Sensor 2,1/4 Mile World's Longest Range Smart Home Water Leak Sensor,Water Leak Detector with Built-in Siren Up to 105dB,Works with Alexa and IFTTT-YoLink Hub Required,YS7904-UC
- YoLink 10 Foot Sensor Cable Water Leak Sensor 2

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-09-20*