The 24-Hour, Electromechanical In-Wall Timer, 20A, 120V, White, 1 Gang he KM2 Series Electromechanical In-Wall Timers replace standard wall switches (toggles) and provide automatic control of outdoor or indoor lighting, fans, pumps, office machines and other types of circuits. Captive trippers are easy to set and cannot be lost. Seventy-two trippers provide up to 36 ON/OFF events in a 24/hour period. Three-way OFF/AUTO/ON override switch provides continuous ON or OFF positions. The timers feature easy wiring and installations.