Smoke detectors, also called smoke alarms, are essential in all homes and businesses. Over time, smoke detectors begin to lose their effectiveness and must be replaced with a new unit. The old one can then be recycled in several ways.
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Remove the batteries.
Take off any extra plastic pieces from your smoke detector and recycle them with your regular plastics.
Mail your old smoke detector directly to the manufacturer--most will accept old units. The name of the manufacturer will be on the back of the unit.
Take your old smoke detector to a recycling center.