Review on Honeywell Home RWD21 Water Leak Alarm: Superior Protection by Resideo, in Sleek White by Casey Vance

This has already saved me from a major basement flood. 12 inches of rain fell in just one hour! Yes, it was a crazy day. My main drain pump was defective. This set off an alarm and I installed additional transfer pumps to get him outside. I still had water but it never covered the whole floor. It could have been a complete disaster. It detects even the smallest water and is loud. Make sure you place it on a flat part of the basement floor and think of a path for the water to flow through so you can catch it as early as possible. Mine is next to my hole in the cesspool. Also remember that if you have cats, they can play with them and move them around. Check the batteries regularly. At the moment my batteries last about 6 months. The downside is that in many cases if this alarm works and the water is flowing fast enough, it's going to be a mess anyway because you can't handle it fast enough. However, it can help prevent a BIG flood. There is a plan! Emergency power supply and additional standby pump. I have a generator and even a wound power strip and AC inverter on the wall in case I need to use my truck for power!