Glentronics, Inc. PWA PHCC Pro Series Water Sensor and Alarm Requires a 9-volt alkaline battery (not included) Battery-saver feature only uses energy when the alarm is sounding for a long battery life Use to detect leaks before costly water damage is caused Detects as little as 1/32 -Inch of water to offer an effective early warning system Loud 110 dB alarm can be heard throughout the house