Warns of leaks and overflows in reservoirs, aquariums or anywhere there is a potential for leaks. Alerts user within hearing range that water has reached desired level when used to monitor the filling of pools, reservoirs, aquariums and more. Low battery signal tells user when it’s time to replace the battery. An ideal backup system for sump and bilge pumps in residential, commercial and marine applications. Circuit test bar ensures system is working. Sensor and alarm can be placed up to 6 feet apart. Loud 85 dB (decibel buzzer). Sounds for up to 3 days. One year warranty.