The 7-Day Programmable In-wall Timer Switch helps you save both energy and money by ensuring that your lights come on only when you need them. Featuring three operating modes and 7 unique programs to best suit your lifestyle. Random mode turns lights on/off to deter break-ins and thieves for added security when you are away from home. Compatible with incandescent and halogen lighting. The large screen and backlight provide clear viewing even at night.