[Rapscallion St Croix]

Recently, I was off living in the woods as I do a couple of times a year and my wife called me at night. One of the smoke detectors kept going off and it was too high on the wall for her to safely reach. I told her to call the fire dept and they gladly came out an disabled it. Our house was built in 2002 and the smoke detectors bore that date. The firefighter told J that they needed to be replaced due to age/technology.

After a bit of research, I ordered First Alert BRK 9120b. They were a near perfect replacement for my old BRK4120. The AC plug was identical but the mount was slightly different. I only had to loosen two screws, remove the old mount, install the new mount, and tighten the screws back up. All is now well with no chirping and high functioning alarms.

If you have BRK4120s in your older home, the 9120b is the way to go.