Refer to the Find a Depot page or call 1-800-667-4321 to find your nearest drop-off location. Each AlarmRecycle location has a drop box available for recycling smoke and CO alarms – free of charge. The maximum limit for return at one time is 40 smoke or CO alarms. If you have more than 40 units, please contact Product Care Association and we will arrange to pick them up free of charge.