TopvicoWater Leak Sensor Detector Flood Alarm for Basement RV Moisture 120dB Work Alone Battery Operated 3 Packs

This is just a simple leak monitor, no apps, no remote detection, just a simple put it where you need it. Its just what I was looking for as I didn't want to be bothered with installing another app on my phone. I got this to put in a ac drip pan to monitor for any leaks or blockages in the condensate drain. It seems to be working well. I tested it and it quickly reacted to water with a loud an piercing tone. Its super loud and you can hear it even if it is hidden up in the attic. Not sure how long the batteries will last so I'll just replace it annually (if I can remember). This is really a good bargain, its so cheap and is working as advertised.

Very sensitive and very loud which is what you want!

I got this for a friend who had a water inlet valve problem on her washer. If we had this little $5 unit in place, there would've been less flooding on her laundry room floor. I like that this comes with everything you need except a 9v battery. It has double stick tape for the control unit and the sensor. You get a pack of 3 for around $15. Cheap insurance! I tested it by putting the sensor under the kitchen faucet. Wow! It's Loud! A nice feature is that it has an on/off switch. Not sure why you'd need it because you'll always want it 'on', but that's handy. I guess if it's going off, you don't want it screaming at you while you mop up the water. This is good for any type of water / liquid overflow. It could be the laundry room, under sink pipes, whatever you can imagine. The cord to the sensor seems long enough. You could always splice more cord into it to make it longer and I'll bet it will work just fine. I was glad to find these in a 3 pack even though I only needed 1. I'm sure you'll come up with other places where a water / liquid sensor could be useful.

Worked and saved us a lot of money.It woke everyone up in this two story house from the basement where we had a leak in the middle of the night. Best $15.29 I ever spent.

Great water detector, very simple 9 volt device that I hope will work a long time. I have 2 spares!

Placed the leak sensor under our dishwasher. Had a leak with our previous unit and this one is getting older. Very dusty area, so I recycled an almondcan cover and improvised a dust cover. We tested the sensor prior to placing it and yes, it's loud but, to me, it's a good thing. I plan to do the same under our washer and hot water heater.

Edited to add: After the original review was posted, the vendor reached out and offered an apology and a full refund. I appreciated that, and added back some stars. I still don't recommend this product for carpeting, but they clearly stand by their product and could be worth a try for a flat flooring like concrete, linoleum, etc.Original review:In Oct. 2022, we had a downspout get clogged, and for the first time in 15+ years, we got water in a carpeted area of our basement. We dried it out, and got these alarms to place along the floor near the baseboards of the wall.The sensors are lightweight, thin metal boards. They don't like to lay down/lay still on their own... if the cord gets nudged at all, they like to turn up on an edge or move around. We wedged them down between the baseboard and the carpeting in the hope that they'd sense the water coming under the baseboard and soaking into the carpeting. We figured sensors near the base of the carpet would be better than one sitting on top of the carpet. We taped the cords along the wall so they wouldn't move and displace the flimsy/lightweight sensors.Today we discovered they did not work for this purpose. The carpet was soaking wet and the alarm never went off. I even pushing the sensor by hand in to the sopping wet carpet - it still didn't go off. Apparently it won't go off until it is literally submersed in a puddle -- laying on top of a soaking wet surface doesn't work. But the whole point of getting the sensors was to discover the water was coming in BEFORE it got too high!!!So... don't buy this for carpet. If you are doing an area that concrete or linoleum or something, it might work. [Edited to add: I will say that we tested the sensors before using them, and they *did* work if set into a puddle on a flat surface.] But if you're buying it for a surface like that, there are lots of heavier/sturdier sensors with no cords that might be better.TLDR - Don't buy for carpet. Flimsy, inconsistent, alarm.

The alarm is very loud and the sensor is very sensitive. Gives you peace of mind.