First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack

We recently bought a new home and made it a top priority to replace all the old, outdated alarms for our family's safety. This 6-pack of First Alert units was the perfect solution to upgrade the whole house at once. Because these are hardwired, we had an electrician handle the installation to ensure the interconnected communication lines were wired safely and correctly.As you can see from my photo, it looks very clean mounted on the ceiling and has a solid green indicator light showing it has power. The precision sensors are excellent because we haven't had a single false alarm from kitchen cooking smoke since putting them up. It gives us total peace of mind knowing that if one alarm triggers, they will all go off throughout the house.If you are moving into a new place and want a reliable, high-quality safety system, this 6-pack is absolutely worth the investment.

Struggled a bit installing as I didn’t use the new ceiling ring and it is a slightly different. Once I realized that, installing new ring and detector went quickly.

From Nest to this. I miss my old Nest Smoke Detectors, but 10 years went by fast. These are basic, simple, no wifi and no voice alerts, no walkway light but are bright in the dark room. Replaced the battery with Lithium 9v over the basic Duracell. Easy to replace. I dont get why others are not able to replace that battery? I dislike that beep in the background.Coming from NEST products it was nice I did not have to get an app to use these things. I do miss the spanish voice alerts and the hallway ring light when people walked by. This does not have that. The important thing is these were more cheaper, well made and should be good for the next decade.

I have 4 older sc9120b model co2/fire alarms that have given me the end of life chirps recently, and found out they are discontinued. BRK says the smIc0100-ac is the new version, I originally ordered from another online W blue mart and they arrived missing the clip in section, just could see the electronic board underneath it nothing to actually connect it to, so thought id try these and they arrived with everything they should including the hardwire if you need it. This model is slightly larger than my originals so I did have to swap the mounts but that was simple and they clicked right into the existing hardwire

Easy install. Electric connectors from old First Alert smoke detectors fit the new smoke and C02 detectors. Did have to replace the mounting base. About 5 minutes each to install the new units.