How to unplug a smoke detector (easy, only 5 seconds…) - YouTube
Kidde 21007581 Hardwired Smoke Alarm with Battery Backup for sale online | eBay
Replacing an old Firex FX1218 hardwired smoke detector? : r/fixit
Hi, I'm going to attempt to replace these Firex smoke detectors myself. can I just buy the most recent model of these and swap them out, leaving all the old wires? Or
Firex i4618 - Hardwired Smoke Alarm | Kidde Home Safety