This timer replaced a standard rocker switch. The switch turned on the overhead lights in the lobby of a member club. Too many times, the lights were left on long after everyone went home. Now, the lights go on just after sunset and go off at 11:00 pm. Wonderful way to save on an electric bill !
Intermatic EI500WC 7-DAY Programmable In-Wall Timer - 15 A SPST 120V great price you do neeed nuetral and common present for this auto timer to work that means white/hot/nuetral easy to program once installed properly 7 day programable setting.