Water Leak Alarm Sensor, Battery Operated Leak Alert, 90dB Water Detector for Basements, Bathrooms, Laundry Rooms, Kitchens, Garages and All Office Areas (Shipped Without Battery, 4 Pack)

These are great. They work as advertised. I put one on the floor in my water utility closet with water heater, reverse osmosis filters, water softener and whole house water filter. Five days later I heard the alarm, It's loud. I checked the closet and sure enough the drain line for the softener system had split. I was very glad that I was able to catch it early and repair the line. Well worth the expense. Recommended.

Works well!

It works. This unit went off at 2am and saved us a chunk o money in flood avoided. Solid, cheap, practical drip detector for under six dollars. But screwing them on is a bit much. Old school analog. Obviously, if you are (a) not at home and (b) cannot hear them --- they are useless. So (a) Get the smart units that send a message to your phone if you are away from home a lot. Next -- and this is important--- it is true as a couple reviewers have noted, the loudness of the alarm is (weirdly) impacted by how you screw the lid on. See pics. Basically, there is a vented 'hole' in the top of the unit. You want that hole clear (you should see a gold tone plate at the bottom) for the sound to emerge vehemently. Otherwise, the alarm is absolutely muffled and remarkably less loud. The problem is there are no markers to help you adjust your 'screw' to make sure the hole lines up with an open space underneath. If you only turn far enough to land the vented hole over something solid (like the battery) you lose, I'd say, about 30db in loudness. It's pretty annoying actually. So we gave up after screwing/re-screwing the first lid on about twenty times trying to get it just right. Eventually, we settled for most units just-sort-kinda right. See pic (pinkie is pointing towards the "open" correct orientation; the other is blocked and alarm is softer sounding). Picture of the single unit shows the gold tone plate underneath that you DO want to be able to see. Problem is... we only got one perfectly aligned like this. :-( Annoying.

Best thing I've bought in a long time

Performs as advertised.

This product has saved us from water damage 2 times. It is very "touchy" The alarm is loud and can be switched off easily. Extremely reliable. Everyone should have them in their home.

Batteries not included no instructions no way to test the device and probably no warning for low battery

I have several different brands at all potential leak locations in the house. Under each sink, behind each toilet, near washing machine, dishwasher, and refrigerator ice maker. What makes these great is the fact that they are easy to open to replace the 9v battery. They simply unscrew the top and bottom. They are loud and the batteries last over 2 years, but I change them out yearly. I have replaced all my other brands with these. A small cost to prevent major water damage issues, especially on wood frame homes or homes with wood floors or carpet. Water leak detectors have saved me on at least 3 occasions from under sink leaks that my wife and I caught early. Don't be cheap and wait till you have damage. These could save you thousands of dollars in repairs and headaches.

I installed 4 of these. Second day the alarm went off under my kitchen sink because the tap started leaking underneath and out of sight. Fantastic, replaced the faucet only instead of finding the leak days later. Cheap and simple but worked great for us.

Tested these, and they work very well. I noted that some reviews cited "not loud", but they are! I did make a mistake intially and did not have the battery seated properly and the lid screwed back on completely, not so loud. BUT, I noticed that the little beeper did not line up exactly with the small grate on the lid. After adjusting the battery the lid screwed completly back into position - grates aligned -- Voila... very loud. Note, I could not establish battery life since I only installed them today. That said... a cost of a battery verses $$$ of water damage. You do the math. So overall... great price, fast delivery... and they do the job! (So far)

As electronic guru I wanted to know what is inside and if it is well designed in order to trust the detector for this important job. So, I opened the box. I can confirm that there is no battery consumption until the water is present to the metal sensors and if you install a good quality battery it will last for many years. The 3 sensors are placed in a triangle and the water need to be present between two of them (only the one that are closer to each other). This expects a water spot larger than 2 inches in diameter and high enough to reach the sensor, 2 mm above the bottom surface. It is done to not touch somehow the conductive floor that will falsely activate the alarm but it requires much more water around and it is possible the alarm to be activated too late. The sound is loud enough to be heard everywhere in a large house. Good product at good price. I will buy more knowing how to modify them to be more efficient.

Didn't come with batteries, but each was individually packaged and all look new, and all worked when put on wet paper towel.

Good little sensors