Water damage can affect anyone. Our smart home water leak sensors deliver notifications right to homeowner's mobile devices via WiFi, alerting them before damage gets costly. This 4' Cable Sensor for Water Leak and Freeze Detectors provides large area coverage for utility rooms, basements and sinks. Cable Sensors detect water along their entire cylindrical surface, responding to both rising water and gathering humidity. To expand the detection area, simply connect additional Cable Sensors up to 500'. The battery-operated system means no wiring, easy installation and fewer callbacks.