Intermatic ST01 7 Day Programmable In Wall Digital Timer Switch for Lights and Appliances, Astronomic, Self Adjusting, Heavy Duty Intermatic ST01 7 Day Programmable In Wall Digital Timer Switch for lights and appliances, astronomic, self adjusting, heavy duty Set it once - follows daily changes for sunrise/sunset times Single-pole or 3-way applications up to 100 feet Controls all lighting and heavy-duty loads like fans and appliances Up to 40 on/off settings per week Incandescent/fluorescent/LED/CFL-compatible