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The WeMo Switch.
The WeMo Motion Detector is about the size of a salt shaker, and plugs into its own separate wall unit for power.
The WeMo app makes it easy to set up the Switch to work with your devices.
The WeMo Switch offers plug-and-play simplicity right out of the box.
The Motion Detector is reliable and easy to use, and you can customize its sensitivity within the app.
Belkin sells the WeMo Switch on its own for $49. For $79, you also get the motion detector, as shown above.