The Belkin WeMo Motion is the perfect partner to WeMo Switch (sold separately), using the free WeMo app, WeMo Motion uses motion to turn electronics on or off. Have electronics go on when you enter a room, or go off when you leave. A lamp, a fan, a heater, stereo, you name it. If you can plug it in, you can control it with this WeMo combination.
An explainer for the Belkin WeMo family.