The Intermatic EJ351 in-wall mechanical timer is easy to program with up to 24 on/off settings per day as well as a random setting that varies programmed daily on/off cycles to deter thieves. The timer also features self-learning, so that if it is not manually programmed, it will repeat the first 24 hour on/off pattern. A 15 minute memory guards against power failure. The EJ351 is for single pole applications and can be used with existing standard wall plates. Please note that when two or more timers are installed in the same wall box, the maximum wattage for this timer is 400 watts. It is intended for incandescent lighting only.