First Alert SMICO105-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup, 3-Pack

Love that these come with a ten year battery, it has been such a hassle to replace the batteries every six months, especially for those areas hard to reach. These came with the same base as my old ones so all I had to do was replace.

Product matched the description, installation was quick and easy and I love the idea that I do not have to hunt down which smoke detector has low battery. I highly recommend this product.

Functionality:Easy to install as replacements for old units. Work well, love that you can silence alarm for "cooking smoke" events

These smoke and CO detectors are easy to install, if replacing similar First Alert detectors. The original connectors in the ceiling worked perfectly for these, but the included connectors would have been easy to rewire, if needed!The only additional work I needed to do is to paint the ceiling - the mounting ring for these is slightly smaller than the previous devices, leaving unpainted drywall visible. This added a paint touch-up job to the front of my installation job.Please write the installation date on the device where indicated. Our original devices were not marked, but my guess is they were part of the original house build 10 years ago, making it time to replace them!

The smoke detectors in our house all needed to be replaced. They were around 10 years old and one of them started the chirping pattern indicating it was malfunctioning. Our prior smoke detectors were hardwired and were made by First Alert. These looked like a great replacement option, especially since they do not require 9 volt batteries; that's right, these have a 10-year battery pre-installed so you'll never get that 3:00am battery chirp.Installation was fairly simple since the wiring harness from my old First Alert smoke detectors was nearly identical to these. I had to replace the mount, but the old wiring harness just plugged into the new smoke/CO2 detectors. A couple things to note here. First, the mounting rings from the old detectors were not compatible with the new ones. Not a big deal to loosen a couple screws and swap the mounts. Second, the mounting rings on my new smoke/CO2 detectors are about a half inch smaller than my old smoke detectors. Also not a big deal, but I can see a paint ring around a couple of my detectors where we repainted the ceiling with the old detectors in place. You can see the size difference in the photo with my old smoke detector on the left (with an X on it) and my new one on the right. It took me less than 3 minutes to replace each detector.A couple suggestions for installation:1. Write the installation month and year in bold pen on the outside of your new smoke/CO2 detector.2. Make sure you can read the installation date from the main part of the room you install it in. That way you can easily see when the unit needs to be replaced.3. Pull the battery tab before climbing a ladder (if you need a ladder). The clear plastic tab can be difficult to remove and you don't want to fall off your ladder.4. Make sure you test every smoke/CO2 detector after you install it. Listen carefully to make sure the interconnect feature works (this is where triggering one detector makes them all go off). I had one defective detector in the bunch that triggered the one in front of me, but did not trigger any of the interconnected ones.These were reasonably priced for what you get. It's a smoke detector and a CO2 detector (though you should also have a CO2 detector closer to your floor as CO2 is heavier than air). They were simple to install, and I won't have to mess with any 9 volt batteries.So why 4 stars? I had one defective detector out of nine. The interconnect feature didn't work on it, and I almost missed that it had issues because the one I was testing still made noise. Would I buy them again? Yes, they are still a good value, look fine, and don't require any additional batteries.

The price is affordable for both a smoke and carbon monoxide alarm. I have been changing out batteries on all my smoke alarm every year, now once a year. Also its very easy and hassle free to install

Great buy and they were exactly what I needed.

Recently, the carbon monoxide/smoke detectors I had installed in my home soon after we moved in started making strange beeps. They weren't triggered and the batteries weren't dead. Turns out they EXPIRE after ten years, thanks to natural sensor degradation. Nothing can be done for this, and they won't stay quiet for long--my only choice was to remove them and get new ones. Older ones don't have this feature--they just hang out like they're protecting you, but DON'T, so expiring is actually a good thing.Since they only last 10 years, these have the additional option of including a sealed, non-replaceable battery that's guaranteed to last the entire 10 years! No more battery changes, just a new unit every 10 years. They're easy to install, and if your system is wired into your house so that all of them trigger when one does, it's a simple plug-and-play if your prior system had the same connectors. If not, you can replace them yourself if you're qualified, or have them installed for you, available through Amazon.These were no trouble at all to install and now there's no more need yearly battery swaps, a win in my book.