Loud 90dB Home Water Alarm - Each water alarm water leak detector has super loud 90dB alarm audio, which can be heard throughout the house even if there is a water leak in the cellar, garage. The water detector sensor will sound as soon as it detects water and warn you of the water leak to avoid flooding Three metal prongs are embedded in the bottom of the basement water sensor alarm, made of ABS material and electronic components, waterproof design, can float on the water to detect leaks. The water detector is powered by 6F22 9V battery (provided with battery). No wiring or screws are required. Unscrew the included battery and install it. Then place the water detector in areas where leaks and floods may occur The water leak detector is 80mm in diameter and 32mm in height, which can be easily placed anywhere you want, such as basement, bathroom, under the sink or through the water heater to detect water leaks.