The ENERLITES HMT01N is a 24-hour mechanical timer that is very easy to use and the three colored wires make it very easy to replace an existing wall switch or timer. The pins are built onto the timer to reduce the chance of losing pins. This timer switch offers up to 24 ON/OFF settings per day, with a minimum time of 30 minutes and a maximum time of 23 hours and 30 minutes. The dial itself is a mechanical clock, so setting the time is quick and easy. A manual override switch allows the load to be turned ON/OFF at any time.