In-wall timers are easy-to-program, 4-button programmable timers that allow up to 40 event settings per week. The timers have an astronomic feature for sunrise and sunset switching. Up to 40 on or off events per week. No neutral required. Random setting turns light on and off at slightly different times each day. Auto daylight saving time adjustment. Astronomic feature, can be combined with specific timed on or off programming. Incandescent or fluorescent or CFL or LED compatible. Controls switched outlets. Auto adjusts to all voltages or frequencies. Programs stored in non-volatile memory. Manual override. CR2 lithium battery provides backup. Single-pole or 3-way compatible.