1/2/4PCS CoRui Home Alarm Water Leakage 110dB Spot Alarm Smart Sensor Detector Flood Alert Overflow Security Alarm System Description: 100% Brand New and High Quality Place the Leak Alarm in any potential flood spot - next to bathrooms, basements, kitchens, boats, garages or etc. When the Leak Alarm detects even a small water leak, it sounds a very loud alarm and lets you know that you have a problem that needs your immediate attention. Automatic operation. Once its three contactors touch water, it will sound immediately with 110dB 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. Specifications: Material: ABS Plastic Color:White Cable lenth:1 meter working voltage:9v Battery:9V Alkaline Battery (not included) Alarm:110dB Package Included: 1*Water Leakage Alarm Detector