First Alert Smoke Alarm, 10-Year Sealed Battery Detector with Test & Silence Button, SMI110, 1-Pack

First Alert Smoke Alarm, 10-Year Sealed Battery Detector with Test & Silence Button
I buy many of these for my rentals since they require the 10 year battery. Super easy to install and so far no issues. Its a great size and value.

Easy Installation – Fits Older Model First Alert Bracket
This model SM110 alarm was easy to install and activate, using a previously installed mounting bracket for an earlier First Alert model A710. This is important for me, because I am an older adult (age 70+) and not keen on standing on a stepladder with a drill or screwdriver.My old smoke alarm was installed by a contractor 12 years ago, so its mounting bracket was properly and firmly attached, but the alarm was also past its end of life. This time around, I wanted an alarm with a sealed, 10-year battery.Although the SM110 is shaped somewhat differently, the base turned out to be the same circumference as the earlier model. This model was easy to fit into the older bracket, and to activate by pulling the yellow tab. However, due to the location of the locking tabs along the side of the base, the orientation of the alarm is slightly different. My alarm was mounted on the wall over my bedroom door. The new alarm fits, but is not quite vertically oriented.This doesn’t affect the function of the alarm. It shouldn’t, since these alarms can also be mounted on the ceiling, so other than aesthetics, the orientation of the alarm when mounted shouldn’t matter. In any case, I tested and the alarm definitely is working.Note: I recommend wearing earplugs when testing — the alarm is very loud and piercing! Quite unpleasant, but I’m a sound sleeper, so in case of fire loud is good.Also, there’s a little embedded green LED light to show that the alarm is active, but it is almost impossible to see.

Doesn’t last even 2 years – wouldn’t recommend
I hardly ever write a bad review, but I need to on this. This says it lasts for 10yrs, but it’s not even close!!Date of manufacture: June 29, 2023We bought it: Nov 2023Today’s date: June 16, 2025Today it malfunctioned or the battery is dying. Not sure which.Whole story: When we bought it we installed it in our temp controlled basement (never gets freezing/overheated). Today when I got home with my small children it was doing the 3 beeps. Not the 3 beeps every 40sec as if the battery were low, 3 beeps constantly, like there’s smoke (but there isn’t any smoke and none of our other smoke alarms (which are a diff kind) are going off). It does the 3 beeps for a range of time, 5-15 min and then turns off on its own if I don’t press the silence button. Then it restarts beeping a bit later. I’ve tried pressing the silence button and I’ve tried taking it to another room in the house, it still restarts beeping. Sometimes it’s silent for several seconds or several minutes before restarting, and there was one time it turned off for almost an hour before restarting. This detector hasn’t even lasted 2 years. Don’t buy this.

NO MORE CHIRPING SMOKE DETECTORS!
I fell in love with this townhome the minute I stepped into it both bedrooms have vaulted ceilings and that’s where they put the smoke alarms for those two bedrooms in the vault along the ceiling. You need extremely long tall ladders to reach them. they were supposed to last forever when you talk to contract people who understand wiring, etc. they tell you these have a 10 year lifespan. Mine died pretty recently. What happened was they couldn’t keep batteries that every time I put a 9 V in they died so I replaced them with these brand new ones and I absolutely love them supposed to also have a 10 year lifespan and there’s no wiring and no place to put a batteries you just put them in your ceiling and I know they work i’m a little crispy toast didn’t mean to test it, but at least I know they work.