Even if you're still using incandescent bulbs, you can do your part to go green. First Alert, known for its smoke and carbon monoxide detectors, also sells this motion-sensing socket that automatically turns on a light when a person enters the room, then turns it off when it hears the sound of that person plopping back down on the couch in the next room or after four minutes, whichever comes first. The sensor does not work with compact fluorescents.
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