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Amre Supply
Amre Supply
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Amre Supply
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Non-returnable. Transportation of this item is subject to hazardous materials regulation
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First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup

4.7 4.7 out of 5 stars 18,935 ratings

$80.49
1 Pack
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Purchase options and add-ons

Brand First Alert
Style Standard Detection
Power source Battery Powered,Hardwired
Colour White
Product Dimensions 4.8D x 14.2W x 14.2H Centimetres
Item weight 0.5 Pounds
Alarm Audible
Sensor type electrochemical,ionization
Global Trade Identification Number 00029054015341
Number of Items 1

About this item

  • Hardwired CO smoke alarm features battery backup for constant monitoring
  • Can connect to other compatible BRK or First Alert CO smoke detectors
  • Lights indicate if the alarm is for smoke or for carbon monoxide
  • Single test/silence button for simple operation
  • Side-load battery compartment for convenience
  • Note: customer should confirm the wiring polarity is correct and that all wire nut connections are secure

Frequently bought together

This item: First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup
$80.49
Get it Jan 16 - 21
In Stock
Ships from and sold by Amre Supply.
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$33.50
Get it Jan 20 - 27
In Stock
Ships from and sold by Consavvy.
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$64.99
Get it by Friday, Jan 17
In Stock
Sold by T0SSI and ships from Amazon Fulfillment.
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From the manufacturer

First Alert
What is carbon monoxide?

Common sources of Carbon Monoxide

Furniture

Dryer Vent

Chimney

What does the beep mean?

4 beeps and a pause

Emergency: Carbon monoxide has been detected. Move to fresh air and call 911.

1 beep every minute

Low battery: It's time to replace the batteries in your carbon monoxide alarm.

5 beeps every minute

End of life: It's time to replace your carbon monoxide alarm.

Recommended alarm placement

Product description

The First Alert BRK SC-9120B Hardwired Combination Smoke and Carbon Monoxide Alarm uses electrochemical CO sensing technology and Ionization sensor for smoke detection. This hardwired dual CO smoke alarm can be connected to other compatible BRK or First Alert hardwired CO smoke detectors within a single-family residence. The latching alarm indicator automatically identifies which unit initiated the alarm--even after the conditions that set off the alarm have subsided. Using a 9-volt backup battery, the smoke and carbon monoxide detector can function even in the event of a power outage. Additionally, the CO smoke alarm features a single test and silence button, as well as indicator lights that let you know whether the danger is smoke or carbon monoxide. The tamper-resistant locking brackets and universal mounting brackets make installation easy.

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First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup


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Top Brand: First Alert

Highly Rated
100K+ customers rate items from this brand highly
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Price$80.49$69.99$80.05$33.72$33.50-15% $62.55
Was:$73.54
Delivery
Get it Jan 16 - 21
Get it by Monday, Jan 20
Get it by Friday, Jan 17
Get it Jan 20 - 27
Get it Jan 16 - 21
Customer ratings
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Customer reviews

4.7 out of 5 stars
18,935 global ratings

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Customers say

Customers find the gas smoke fire alarm easy to install and maintain. It works well and is simple to replace if needed.

AI-generated from the text of customer reviews

7 customers mention "Ease of installation"7 positive0 negative

Customers find the gas smoke fire alarm easy to install and maintain. It's hardwired with a battery backup, and it's easy to replace from an older model.

"...It is nice how easy these are to replace for a hardwired option when the mounts are the same. This was the best place to buy them cost wise." Read more

"...Easy to install and battery included . No longer available in store. Very satisfied/" Read more

"...Very little maintenance required. Hardwired with a battery backup. Very happy with this product." Read more

"...Alert products, the existing collar fit the new alarm which made installation easy...." Read more

6 customers mention "Functionality"6 positive0 negative

Customers like the functionality of the gas smoke fire alarm. It works well.

"...First Alert Fire/Smoke alarm and it fit perfectly and does the job as intended" Read more

"...Item arrived on time, and takes me 2 mins to install it. Working well, and I like it." Read more

"...It was easy to attach to the collar of the first one. Works good so far." Read more

"Work well. Peace of mind knowing they're keeping my house and family safe!" Read more

Top reviews from Canada

  • Reviewed in Canada on July 6, 2023
    Size: 1 PackVerified Purchase
    Our older model of these were about 8 years old and didn’t have the replaceable battery so when they started beeping randomly here and there, we had no options but to change it up. It is nice how easy these are to replace for a hardwired option when the mounts are the same. This was the best place to buy them cost wise.
  • Reviewed in Canada on August 8, 2023
    Size: 1 PackVerified Purchase
    bought this to replace my previous First Alert Fire/Smoke alarm and it fit perfectly and does the job as intended
  • Reviewed in Canada on September 3, 2023
    Size: 1 PackVerified Purchase
    Exactly match the one I needed to replace / same brand even if the model number had change/
    Easy to install and battery included . No longer available in store. Very satisfied/
  • Reviewed in Canada on September 14, 2023
    Size: 1 PackVerified Purchase
    this is a replacement hard wired smoke detector. I found it quite expensive.
  • Reviewed in Canada on October 7, 2022
    Size: 1 PackVerified Purchase
    Smoke detector is a great choice for the price, it detects smoke and carbon monoxide. Very little maintenance required. Hardwired with a battery backup. Very happy with this product.
  • Reviewed in Canada on December 15, 2023
    Size: 1 PackVerified Purchase
    C’est le même modèle qu’on avait avant
  • Reviewed in Canada on August 19, 2022
    Size: 1 PackVerified Purchase
    Orderd this one to replace my order version alarm system.
    Item arrived on time, and takes me 2 mins to install it.
    Working well, and I like it.
  • Reviewed in Canada on November 30, 2021
    Size: 1 PackVerified Purchase
    We used the new alarm where we previously had a smoke detector, as they were both First Alert products, the existing collar fit the new alarm which made installation easy.

    Our previous carbon monoxide alarm expired so having the double alarm in one unit is great. We haven't had it go off yet, and hopefully it never will, but it is there if needed.

Top reviews from other countries

  • EMC
    4.0 out of 5 stars Great Product - Crazy Price Increase
    Reviewed in the United States on December 14, 2024
    Size: 1 PackVerified Purchase
    I purchased one in Jan 2023 for $30 and the price has nearly doubled in 2 years. Its hard to put a price on safety and manufacturers know this.
  • Shawn Harvego
    5.0 out of 5 stars Works great
    Reviewed in the United States on December 16, 2024
    Size: 1 PackVerified Purchase
    Does it's job easy to install
  • Bernard
    5.0 out of 5 stars That’s cheaper when you buy the five pack.
    Reviewed in the United States on January 11, 2025
    Size: 1 PackVerified Purchase
    The fire detector plugged right in, but I did have to change the bracket that took two minutes.
  • Brian 24
    5.0 out of 5 stars Great detector.
    Reviewed in the United States on December 27, 2024
    Size: 1 PackVerified Purchase
    A great smoke detector at a great price!!!
  • Gabriel's Dad
    4.0 out of 5 stars Easy to replace
    Reviewed in the United States on February 11, 2018
    Size: 1 PackVerified Purchase
    These things are apparently programmed from the factory to go off only in the middle of the night. The beeping is just loud enough that you can't just sleep through it. And the darn beeping occurs with too much of a delay so that when you do get up to find it, it takes way too long in the middle of the night to triangulate and figure out which one you have to take down so that you can go back to sleep and deal with it in the morning. It's like some torture game of hide and seek. By the time you figure out which one is malfunctioning, you've been awake and annoyed long enough that you're pretty much now wide awake. Is it some kind of North Korean/Russian plot to destroy the lives of normal mundane US citizens through intermittent sleep deprivation? First the election, now this.

    One chirp every 3-4 minutes means that the 9V back up battery is dead. Three chirps that go off every 3-4 minutes indicates that the detector as a whole is malfunctioning. Replacing the battery doesn't do anything. I've tried dusting them out with an air gun but usually doesn't work. Most authorities recommend replacing these things about ever 5-10 yrs or so. So far, about 5 years is about how long these have lasted in my house, and over the past several months I've been replacing one after the other. I've lost enough sleep on random nights over the past several weeks that I'm just going to replace all the rest of the ones in my house and just move on with my life.

    As a bonus annoying factor, the 9V battery lasts about 4 yrs. I just went through and replaced all the batteries less than 9 months ago, and now I'm going around replacing the whole darn thing. So that was a nice waste of money, especially since the new detectors come with new 9V batteries and now I have a small stockpile of partially used 9V batteries.

    The only good thing is that they are easy to replace, and much cheaper on Amazon than the local brick and mortar stores. And thankfully, I haven't had one go off because of a house fire or carbon monoxide buildup, so I can't comment on their effectiveness, but I guess it's one of those things you just have to assume will work when it needs to... like the airbag in your car.