Honeywell Home RWD11 Water Leak Detector Alarm - Wireless Water Sensor for Basement, Bathroom & Kitchen - Early Flood Warning System for Home Protection

I can't tell if they work (hope I will never have to), but the size is small enough to fit under tight spaces around the dishwasher, washing machine and under the sinks. So far so good.Update 7/20/18WORKS!!! We had a small leak under the sink that would have gone undetected for a long time. We had a super annoying alarm go off in the bathroom with no idea what it was (happens if you put it under the sink and forget about it) and had no idea what the hell was going on. We started trouble shooting the fire alarm first, until we finally figured out that its the leak alarm!!! We found some water, not much yet, but I think overtime, it would have done a lot of damage.