This is the Motionbulb, which is a light bulb that can turns on and off automatically depending on whether there are people in the room. The Motionbulb works by detecting the temperature changes caused by human activities in a room. You may also adjust how long you want the bulb to stay on if there are no human movement.
The Motionbulb is priced at 19.95 and is available here.
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