The reliable TORK digital timer is designed for residential and commercial use for a variety of applications required to be automatically turned on and off. The 40 Amp timer allows you to program heavy-duty appliances including your air conditioner, heaters, pumps, signs, fans and lighting, helping you save energy and money, while adding convenience to today's busy lifestyles. When used for lighting, it's compatible with incandescent, compact fluorescent and LED light bulbs and can provide home or office safety and security by turning lights on while you are away.