ITEM NAME:Home Independent Wireless Water Leak Detector Sensor 90 dB Volume Alarm CHL Descriptio n Description : Automatic operation. Once its contactors touch water, it will sound immediately with 90dB loud alarm; No buttons, no programming, just place it where you want to check water leakage; Requires a 9-volt alkaline battery(not included),and normally a new battery can last for 1 year; Use by water heater, sink cabinet, sump pump, washing machine, radiators and more; Made of durable ABS Plastics. It is specially designed to float in flood circumstances. Specification: Material: ABS Plastic Color: White Size(Diameter x Height): about 8 x 3.cm (3 x 1†) working voltage: 9v Battery: 9V Alkaline Battery (not included) Alarm: 90 dB Package Included: 1*Water Leak Detector High quality buy, happy buyï ¼ Wireless Water Leak Detector Sensor 90 dB Volume Water Leakage Alarm for Home.1 Water Leak Detector. No buttons, no programming, just place it where you want to check water leakage;. Made of durable ABS Plastics. It is specially designed to float in flood circumstances. Alarm: 90 dB.