Intermatic FD430MW 30-Minute Spring-Loaded Wall Timer for Lights and Fans, White These energy saving timers use no electricity to operate These timers are designed to replace any standard wall switch, single or multi-gang Automatically limit the "ON" time of fans, lights, motors, heaters and other energy consuming loads Time saving "up front" terminal connection with teeter type terminals Easy "press-on" knob design ensure quick and easy installation