Smoke Detectors and Carbon Monoxide Alarms 
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Check the back of your device. Most companies have a take back program! 
If the device is any of these brands, head to the link below to inquire about getting them returned. 
First Alert
BRK
Onelink
Family Gard

Head over here and you can get in contact with their customer service. It's a complimentary disposal program for up to five intact ionization detectors (postage not included). If you have more than five detectors, there is a fee of $1 per unit.