Gizmode the Original Water Alarm 9volt Water Alarm Detector, 110db Alarm Wa01 Incredibly loud alarm (110+ dB) can be heard in cabinets and basements Effective - it can detect the slightest amount of moisture Very Affordable-get enough units to protect your entire home for less than your insurance deductible Long Battery Life - new batteries recommended every 2+ years - chirps when batteries are low Approximate dimensions (Height/Diameter): 2 7/8" x 2 7/8", 1 year warranty