How to recycle smoke detectors

Drop off your old smoke detectors for free at your local waste transfer station.

[radiorob]

In the USA, you can't recycle them. Depending on state, you may have a hazardous waste drop off. But many of them wont take smoke detectors. You have to send them back to the manufacturer, at your expense. Some like my state, let you put it in common garbage, to be taken to the garbage dump.