This Indoor Mini Mechanical Plug-In Timer is an excellent choice for regulating your interior lights and other electronics into an automated on/off cycle by setting up to 48 different on and off times daily. The timer just plugs into any standard outlet and the appliance you want to control then plugs into the timer. Once everything is plugged in, set the clock with the twist of the front dial and then simply press down on the trippers, each representing a fifteen minute increment, for the times you want the device to be on. 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 to help deter criminals while you are away. A manual button is a convenient option if you wish to override your current timer status. 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.# Indoor Mini Mechanical Plug-In Timer # Owner's manual