You'll never forget to turn off the lights if they're connected to an easy-to-use wall-mounted timer. The Spring-Wound Wall-Switch Timer shuts the lights off for you when the time runs out. Set it for any amount of time up to 12 hours. This traditional style twist-to-set timer fits in a contemporary Decora wall plate (sold separately). # Timer # Time dial plate # Nut # Knob # Instructions.The Spring-Wound Wall-Switch Timer has a completely mechanical design that breaks the circuit completely at the end of the timing cycle you specify. Connect it to a light, a ceiling fan, or any other appliance in its power range. The Spring-Wound Wall-Switch Timer is also available in ivory, 15 minute version, 30 minute version, and a 60 minute version.