Battery Combination Smoke & Carbon Monoxide Alarm | SMCO200, Slim Profile

This First Alert combo smoke and carbon monoxide alarm does exactly what it’s supposed to do — protect your home — and does it without being bulky or obnoxious. The slim design is a big win. It sits flush and clean on the ceiling or wall and doesn’t look like a giant plastic UFO hovering over the room. Setup was quick and easy, the battery operation means no wiring headaches, and it feels solid and well-built. Knowing it’s watching for both smoke and carbon monoxide is huge peace of mind, especially at night or when you’re not home. Basically, it’s one of those products you hope never has to prove how well it works — but you’re really glad it’s there just in case. Reliable, simple, and smartly designed. Exactly what a safety device should be.

These combination detectors are really good and worth every penny. I had one prior to this one same brand and unit but disposable with a built-in battery. I like this one because I can replace the batteries, it uses 2 AAA batteries because it's so thin and will let you know when the batteries are low.

Solid. I trust it will work as designed!

Just got it today. Seems well made. Good price. Time will tell.

It’s a good buy and name brand quality.

Smoke detector body will not attach to base. Body should attach with a clockwise turn, but something prevents body from turning. Body cannot be attached.

Haven't had this very long, but appears as described. Easy to install. I like the fact that I can replace the batteries when they run low. My last one had an internal battery and was 9 years old and it began chirping. The nice option of having one with a battery is when it's time to replace the unit around 10 years lifespan, I have time to replace it. With the internal battery, I had to rush to replace it and was without any system for over a week.

The base is slightly larger than an earlier model so I needed to screw in an extra anchor hole. One I could reuse.