The Amperite 120A15MST1A is a time-delay, single-pole, normally-open (N.O.) type, 15-minute timer. It is designed to automatically switch power on and off to specific loads, such as exhaust fans or pool pumps. The timer can be used for automatic scheduling or bypass operation, which allows for manual control. The contacts are rated for up to 15 amperes, 120 VAC and have a mechanical life of 100,000 operations. The timer has an orange body color, with a green start knob, and it can be mounted on a standard switch box.