The WeMo Insight Switch works with the free WeMo app to give you wireless control of your appliances and electronics; turn on a space heater to get the room nice and cozy before you get there, be at ease that you turned off the hair straightener or iron after the morning rush or bring on the holiday cheer and turn on the holiday lights! Put your little ones to bed and turn off the reading lamp and turn on the nightlight as you tuck them in. Modular system. Users can add additional switches easily any time. Control as much or as little of the home as desired. Plugs into any regular 120V wall outlet.