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Did you know dead batteries are the main reason smoke alarms fail? That's what makes Dupont's award winning self-charging smoke alarm so special! No more buying and changing batteries � it feeds off your home's electricity. Designed for high risk areas like laundry rooms, garages, furnace rooms, workshops, attics, closets and more. Perfect for any ceiling mounted OPEN light socket. (not for use in lamps and recessed lighting)