The IW600K self-adjusting wall switch timer allows you to set it once and forget it. Never bother with resetting again Use with decorator style wall plate (sold separately). Controls LED, CFL and Incandescent lighting. This timer utilizes an astronomic feature to keep track of daily sunrise/sunset changes and automatic daylight saving time adjustment. The large LCD display provides an easy readout of time of day, mode and load status. The random feature can vary the time your lights turn on by a few minutes and deter burglars.