If you don't have your outdoor lights on a timer, GoGreen's Outdoor Digital timer is a must for homeowners! First and foremost, putting your lights on a timer will help reduce your electric bill by preserving energy and helps save the longevity of the lights whether they are for your beautiful landscaping or those festive holiday decorations. During the holiday season, this timer will come in handy when installing and showcasing your Christmas, halloween or other outdoor lights. The timer includes a clever photo-electric light sensor which will turn on your light at dusk and off at dawn. No need to figure out any on/off times! Please see below instruction chart to get your new timer up and running....in no TIME!