Wish your WaterHound or FreezeHound sensors plugged into an outlet instead of using 2 AA batteries? Then expand with this AC adapter designed specifically for WaterCop-compatible sensors. Prevent uncontrolled water and freezing pipes from damaging your home and belongings with the WaterCop, a wireless leak detection system that automatically shuts off your main water line when it senses a leak from your home's water appliances or plumbing fixtures. The main system consists of a WaterCop electronic shut-off valve and three wireless, battery-operated WaterHound probes. The shut-off valve installs on your home's main water line between the existing shut-off valve and the location where the plumbing main begins to branch off to water appliances, like washing machines, water heaters or dishwashers. The main unit plugs into any standard 3-prong power outlet with its 8-ft. extension cord and features green and red LEDs indicating if the water flow is open or closed.