WeMo Switch and Motion Sensor, Control Your Electronics From Anywhere
Turn Electronics on/off from Anywhere; Motion Control your Lamp, never walk into a dark room again; Get SMS or Email Notifications when movement is detected at home (powered by IFTTT.com)
You’ve already got everything you need: WeMo works with your existing Wi-Fi router and any Apple iOS (v5 or higher) and Android smartphones and tablets
Modular system – You can add additional WeMo Switches and WeMo Motion sensors easily, any time. Control as much or as little of your house as you want to.
Link