Need to automatically control lights, pumps, signs, or heaters on a 24-hour schedule? The Intermatic T102 is the classic, heavy-duty mechanical timer for the job. It's built for commercial and industrial use, handling up to 40 amps at 208-277 volts. It's a simple, wind-up mechanical clock with a dial that's marked in 24 hours. You set your schedule by plugging in the little plastic 'trippers' (one 'on' and one 'off' are included) around the dial. You can have up to 12 on/off cycles per day, with a minimum of 1 hour between changes. The case is all-metal for durability. Installation requires wiring it into your electrical circuit (consult an electrician if unsure). It's a reliable, no-frills workhorse for automating almost any electrical load on a daily cycle – think turning parking lot lights on at dusk and off at dawn, or running a water pump on a schedule. UL and CSA listed for safety.