Power your WaterCop Classic flood and temperature sensor by plugging them in with the WaterCop Power Adapter for Flood/Temp Sensors. This optional power adapter wires into the sensor and plugs into a standard outlet, eliminating the need for batteries. It works with sensor models WCDFS1, WCFS2, and WCDFST (those with an internal antenna). NOTE: Not intended for use with older sensor models WH100, WH200, and FH100 (with external antennas). To power these sensors, purchase the older power adapter model ACA100.