The average water leak causes $7000 in damage (source American Insurance Association) . Be notified of a water leak while it's measured in drops. The Lyric™ Water Leak and Freeze Detector detects water with sensors on base of unit or has expanded coverage with included 4 ft. water sensing cable. Entire cable detects water. YCHW4000W4004 is a 4-pack that includes 4 leak detectors, cables, batteries and mounting kits.