Xcellent Global Leak Alert Home Security Automatic Sensor Water Leak Flooding Alarm M-HG027 Great for water heaters, sump pumps, under sinks, toilets, basements, aquariums etc. Water Leak Detector Alarm will sound when any water is detected by its remote water sensor. 1 x 9V battery requried but not included Alarm voice: Lound to 120dB Quick & Easy Installation