... , dishwashers, sinks, aquariums, sump pumps, water heaters, and anywhere with potential water damage2) Specification:Working Voltage: 12VMax. working current: 80mAStandby ... tone but the sound level is a little smaller than with AC power.Central unit is not waterproof. Therefore please ... that may cause false warning sound. Ground water detector system with solenoid valve for stop water leak