First AlertSMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack

Easy to Mount and you don’t have to change the batteries. Just replace the whole thing. I prefer this over the ones you need to replace the batteries every year. One less thing to think about. I did use this one to replace an older model. It did start randomly going off, I guess that is even you know to change it. Not sure tbh

Slim profile, 10 year battery, voice alert scare during set-up and testing - you think there is CO2 in the air and or/smoke - only testing it's 'voice'. If you are quick enough it can be set to announce a certain room, in my case I wasn't so it says master bedroom in living room, doubt I can change it. Nice unit, bought along with this brand's non-talking model. 5-STARS

Low profile. Easy install, no maintenance or upkeep of battery, use it for 10 years or whenever the service beep occurs and then toss it. I replaced an older model with this, and so far so good!

I bought 5 of these when I moved into a home I bought a couple of years ago. On 3 different occasions, 3 different fire alarms had false alarms. These false alarms last 2 minutes and in my case occurred in the middle of the night. On many occasions, my wife and I would wake up in abject horror. Adrenaline dumping into our system as I jump up and try to find the source of the sound. As soon as I run downstairs it stops. I check around the house. Check the other smoke alarms, calm down and go to bed. Only to be woken up again in an hour.Finally, I figured out that these first alert alarms are the issue. The fun part is they are sealed and cant be turned off. So how do you stop them from keeping you up? No other solution but a hammer. You take it off the wall and bring it outside and break it in a million pieces.After realizing that these are garbage, I threw away 4 of them. But I forget the 5th one which was in the basement, in a room with a c02/smoke alarm from a better company. Sure enough, 2 years later, at 2:30am the piece of junk goes off for two minutes then goes silent. I just out of bed in horror, unable to find it before it stops. After the second time, i realize the sound is coming from the basement. I go down there and see that stupid first alert logo looking at me and realize that I have forgotten this last unit was year when I smashed the others two years ago. So I break out the old hammer and put it out of mine and its misery.To be clear- I have several redundant c02/smoke alarms from other companies in the house that havent gone off. So this is not a case of there being c02 or smoke that I have missed. These are just garbage.I have never written a bad review on amazon. Just this one. To say that I will never touch another first alert product in my life doesnt come close to the animosity I have for this product.

Had to return the first one because it was not operating correctly right out of the box. But the replacement came quickly, ready, and working. East to install.

Easy to install excellent instructions quality product. This is my third one of them and out of they last for years.

This installed the easy. Directions were simple. The features cover all the needs I have for a smoke and carbon monoxide alarm. It’s hard to write a review for something like this, since you don’t know a bad one until tragedy strikes. So far we have not had nuisance alarms.

Arrived on time; works as expected!