Customer Reviews For The First Alert SC9120B Hardwired Combination Smoke/Carbon Monoxide Alarm

Unit tested as described in the instructions. Unit fitted nicely on the same place of the old unit without having to do any additional alteration and installation was quite easily by following all the steps in the installation instructions.

No fuss no muss

Replaced existing hard wire detector. The old detector was at the end of life and was triggering at random times. Since replacement all is well.

Easy To Install

Installed 2 of them, one in the upstairs hallway and one in the main living area hallway for safety measures.

Smoke CO alarm replace

These all arrived in a timely manner and worked perfectly when we installed by ourselves.

Peaceful Existence

The speed with which my order was filled quite surprised me. The gentlelady who took my call was, indeed, very gentle. The item arrived I plugged it in, putting an end to the nuisance of the chirp. Peace has returned.

smoke/carbon monoxide alarm with battery backup- SC9120B

Very good so far right out of the box

smoke alarm/carbon monoxide dector

Very happy with first alert products for the past seven yrs.

Safety

I purchased First Alert smoke and monoxide alarms for my home. It's a great feeling knowing the safety that was installed ,not only for saving lives,but home protection as well.

mfg date is awesome

Quick delivery, awesome prices and the mfg date is within a month or 2 of ordering date, better than getting it at the hardware or big box stores where the mfg date is 4-5 years old

Replacement Smoke /CO-2 Detectors

Terrific product. Very effective to assure your safety.

Fast & easy order

We were very pleased with the ease of ordering & the fast shipping. 😊

great

have used tis brand for many years and will continue, very reliable .

Smoke Alarm

Received quickly. Easy to install. Works well

Smoke alarms

Replaced the old ones

very happy with product,fast delivery, simple change out

Great experience

Got what I needed quickly and easily.

Smoke and MO ALARM

Dependable, efficient, replaceable battery.

Repeat Customer

Great prices, Name Brand, excellent packaging. Fast shipping.

First Alert Hardwired Combination Smoke/Carbon Monoxide Alarm with Battery Backup - SC9120B

Install instructions are good. One unit had missing battery.

First Alert Hardwired Combination Smoke/Carbon Monoxide Alarm with Battery Backup - SC9120B

I bought 7 SC9120B Smoke/Carbon Monoxide alarm in Jan 2022 and installed them. All are working fine. No more chirping sound.