Kidde Firex Smoke Detector, Hardwired with 9-Volt Battery Backup & Front Load Battery Door, Adapters Included, Smoke Alarm 21029886 - The Home Depot
Hardwired Smoke Alarm Firex i4618 | Kidde
Kidde Firex Smoke Detector, Hardwired with nine-V Battery Backup & Front-Load Battery Door, Smoke Alarm, 4-Pack 21030967 - The Home Depot
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
Kidde Firex KF30 review - Which?
Firex 484 Photoelectric Smoke Alarm Detector, 120V AC Direct Wire (Upgraded to P12040 + KA-F)