Gizmode The Water Screamer Loud 130 dB Siren Water Alarm Water Alarm Loud 130 dB Extra-loud siren (130 dB) can be heard anywhere in the home or workplace Detects moisture/water before damage occurs Sensor legs (4) directly contact any surface for accurate and immediate moisture detection Built-in additional battery bays for use of optional second & third batteries Dimensions (Height/Diameter): 2 1/2" x 4 1/2" One-Year Warranty