The Westek Indoor Daily Segment Timer will limit use of your interior lights and other electronics by setting them to an automated on/off cycle with up to 96 different on and off times daily. The timer just plugs into any standard outlet and the appliance you want to control, and then plugs into the timer. Use it for a few indoor lights to keep you from coming home to a dark house or to give your home that lived in appearance which will help deter criminals while you are away. By limiting the amount of time your lights are on you can significantly reduce the amount of energy being used and eliminate the cost for that energy. It is a great low cost way to automate your lighting up to 1875W (or 15A) and control the amount of power they are using.