Replacement for a standard indoor wall switch, with decorator style wall plate (not included). To be used with standard base incandescent light bulbs only. Flush mounted, replaceable battery backup, batteries included (2- lr44/sr44 batteries). 7 ON/7 OFF settings per day. Programming options: same settings Monday-Friday, same settings Saturday and Sunday, same settings every day of the week or individual daily settings. Optional random feature to deter burglars. Automatic daylight saving time adjustment. Must be connected to a permanently wired light fixture, not a wall receptacle. 500-Watt incandescent, 120 VAC, 60 Hz, 4 amp tungsten.