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First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack

4.7 4.7 out of 5 stars 17,184 ratings

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About this item

  • Keep your family safe with this hardwired smoke alarm the battery backup means constant monitoring, even if there's a power failure
  • Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast flaming fires and alerts you with an 85 decibel alarm
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • Can connect to other compatible BRK or first alert smoke detectors, to ensure all alarms will sound when smoke is detected
  • Simple to use, with a single test/silence button, and side load battery compartment tamper resistant locking brackets and universal mounting brackets make installation easy
  • Rigorously tested to meet UL standards120 volt AC power with 9V battery backup to keep alarm functioning during power outage
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
See more product details

Customer ratings by feature

Easy to install
4.6 4.6
Noise level
4.6 4.6
Value for money
4.5 4.5
Instruction quality
4.5 4.5

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First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
BRK First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
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Price$14.12$16.99$30.29-14% $50.72
Typical:$58.78
$65.99
Delivery
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Customer Ratings
Easy to install
4.6
4.3
4.6
4.8
Value for money
4.5
4.2
4.5
4.8
Instruction quality
4.5
4.0
4.5
4.7
Battery life
4.2
4.4
4.3
4.5
Sold By
Amazon.com
Siterlink
Amazon.com
Amazon.com
General King
power source
Battery Powered
Battery Powered
Corded Electric
Battery Powered
Battery Powered
sensor type
Ionization
Photoelectric
Ionization
Ionization
Ionization
style
9120BFF
Hardwired Interconnected Model
Smoke
9120B
Hardwired
alarm
Audible
Visual, Audible
Smoke
Audible
Audible
weight
0.05 pounds
0.7 pounds
0.6 pounds

From the manufacturer

First Alert
Super Prepared Family

Smoke

Carbon Monoxide

Extinguishers

Escape Ladders

Smoke Alarms

Place at least 10 feet from kitchen/stove, and on the ceiling or high on a wall, no more than 10 inches from top.

Carbon Monoxide Alarms

Carbon monoxide alarms can be placed anywhere, not just the ceiling or high on a wall. They should be replaced every 5 to 7 years.

Fire Extinguishers

Keep in the kitchen and garage, but make sure to have the right grade for the type of fire that might occur.

Escape Ladders

Have at least one if your home has more than one story. Each room needs 2 escape routes; in most bedrooms it's the window, so have a ladder nearby.

Recommended Placement

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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First Alert 9120BFF Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack


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Product guides and documents

Product Description

Product Description

Promote greater household safety with the First Alert 9120BFF Hardwired Smoke Alarm with Battery Backup. This 120 volt AC smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast flaming fires and alerts you with a loud 85 decibel alarm. Designed to be wired directly into your home's electrical system, this hardwired smoke detector features a backup battery that helps keep the alarm functioning even in the event of a power outage. The gasket less mount helps ensure a perfect alignment for easy installation, while tamper resistant locking pins keep the alarm secure. And thanks to the convenient test/silence button, you can easily check whether the alarm is functioning properly and mute false alarms. This smoke alarm can integrate with up to 12 other First Alert or BRK hardwired alarms and features a latching indicator that identifies which unit triggered the alarm.

Amazon.com

Introducing the revolutionary BRK 9120 series smoke alarms which have been redesigned from the ground up. They install faster, perform better, and are even smarter than before. All of these improvements help reduce nuisance alarms and save you time and money. BRK Electronics smoke alarms are designed to be easy to install, easy to maintain, and quality-engineered for years of virtually maintenance-free service.

The 9120B AC-powered smoke alarm with battery backup includes these features:

  • Ionization sensor which helps detect fast flaming fires that consume combustible materials rapidly.
  • 120-volt AC inter-connectable (with maximum 18 compatible devices). The alarm can be interconnected with up to 12 other compatible smoke alarms and six compatible devices like bells, horns, repeaters and door closers. If one unit triggers an alarm, all smoke alarms in the series will sound. Power indicators show which unit in the series initiated the alarm.
  • Latching alarm indicator which automatically identifies which unit initiated the alarm.
  • Smart technology to reduce nuisance alarms.
  • 9-volt battery backup for peace of mind during power malfunction.
  • Single test/silence button which both silences a non-threatening alarm or low battery warning and allows you to test the unit's functionality.
  • Perfect mount system including a gasketless base for easy installation and new mounting bracket that keeps the alarm secure over a wide rotation range to allow for perfect alignment.
  • Mounting bracket lock for tamper resistance.
  • Dust cover to keep unit clean during construction.
  • 10-year limited warranty. All BRK Electronics smoke alarms meet UL 217 standard and are listed with the California State Fire Marshal. They use the new UL mandated repeating 85-decibel alarm horn pattern. 10-year limited warranty. This unit is approved for sale in Oregon after new revisions on law HB2586.--Bree Norlander

    What's in the Box
    One smoke alarm, one 9-volt battery, and user's manual

Important information

Bulb Voltage

120 volts

Customer reviews

4.7 out of 5 stars
4.7 out of 5
17,184 global ratings

Customers say

Customers like the appearance, ease of installation, performance, quality and fit of the smoke alarm. For example, they mention it looks good, it's easy to install and the instructions are straightforward. That said, they say it performs one function and is a good replacement. Customers are also impresseded with the fit, saying the adapter plates fit the ceiling boxes perfectly.

AI-generated from the text of customer reviews

982 customers mention952 positive30 negative

Customers find the installation of the security electronics to be easy. They mention that it's a direct fit, plug-and-play replacement for their original first alert that came with their home. They also mention that the installation process is simple and quick.

"Perfect replacement. Fit right in, super easy to install and works seamlessly with the rest of the detectors in the house...." Read more

"...This replacement smoke detector was easy to install. It took less than 1 minute to unscrew and unplug the one and set up a new one...." Read more

"...On the plus side, these were very easy to install since I had to replace the same brand using the existing wiring with just plug and play with..." Read more

"...Totally fixed the problem. Very easy to install if you currently have a First Alert set of hardwired battery back-up detectors in your home...." Read more

830 customers mention770 positive60 negative

Customers are satisfied with the performance of the smoke detector. They mention that it works great, all 7 worked correctly on installation, and is perfect in all aspects. The detectors are easy to test and are easy-to-change.

"Perfect replacement. Fit right in, super easy to install and works seamlessly with the rest of the detectors in the house...." Read more

"Good price, works well" Read more

"...All is working fine. Going to replace the rest of my detectors this week (13 years old)." Read more

"...they work during a fire and I hope I'll never have to, but the test button does work...." Read more

731 customers mention560 positive171 negative

Customers like the quality of the security electronics. They mention it's a good replacement, easy to install, and a simple swap to most builder installed units. It's well-put together and completely compatible as a replacement. Customers also say that the technology has been super improved.

"Perfect replacement. Fit right in, super easy to install and works seamlessly with the rest of the detectors in the house...." Read more

"Good replacement, easy to install...." Read more

"...These are exact replacements and with newer technology than my old ones. Great price and value for the money to protect my family!" Read more

"...on a daily basis, mostly in the middle of the night, one will trigger the "latching alarm" when the humidity changes and each unit takes turn..." Read more

464 customers mention453 positive11 negative

Customers appreciate the value of the smoke alarm. They say it's worth the money and is a good product for the money.

"Good price, works well" Read more

"...Great price and value for the money to protect my family!" Read more

"reasonable price" Read more

"Our detectors needed to be replace. The price was reasonable. Will recommend to others to buy" Read more

158 customers mention140 positive18 negative

Customers like the fit of the security electronics. For example, they mention the base plate fits perfectly against the existing fittings in the ceiling, the wiring and previously mounted housing fit perfectly, and the adapter plates fit the ceiling boxes perfectly. The mounting bracket fits perfectly on to the old box. The universal size was convenient, and it matched up perfectly to their old unit.

"Perfect replacement. Fit right in, super easy to install and works seamlessly with the rest of the detectors in the house...." Read more

"Bought a bunch of these to replace our 20 year old units. Fitting could not have been easier, basically remove the old units by unscrewing 2 screws,..." Read more

"This unit was a replacement for an old unit. It was a good fit with no installation problems. I didn't even have to change the old mounting bracket...." Read more

"Exact fit for the ones our house came with when new in 2005, plugs right in no muss, no fuss, just perfect." Read more

101 customers mention97 positive4 negative

Customers are satisfied with the appearance of the security electronics. They mention that it looks good, is very nice, and is a great ceiling ornament. Some say that the mounting plate was perfectly designed and that the general design doesn't change.

"...I bought these and they look great. I can't tell you if they work during a fire and I hope I'll never have to, but the test button does work...." Read more

"...Remember to shut off the circuit breaker!The alarm itself looks great. I like the design a lot better than the flat plastic orb...." Read more

"...It is small and beautiful. There is a backup battery in case the house is out of power. The installation is pretty easy...." Read more

"...While we have not had a fire, they look official, appear to be working, and have been tested using the test feature AND by boiling water and making..." Read more

249 customers mention133 positive116 negative

Customers are mixed about the battery life of the security electronics. Some mention that it has a battery backup, while others say that it doesn't work with the provided battery.

"...Comes with an included battery which is a plus given that 9V batteries are expensive." Read more

"Cannot comment of battery life because it is brand new but the AC Delco batteries have laste previous for a long time in the others." Read more

"...Basically plug and play and comes with a full 9 volt battery. Very pleased so far." Read more

"...I put a new battery in it and it still chirps. The battery relacement is not that easy, and I don't see any connection for the battery...." Read more

165 customers mention57 positive108 negative

Customers are mixed about the noise of the security electronics. Some mention that it no longer has the annoying chirping, and the alarm is loud enough to get anyone's attention. However, others say that it started sounding the annoying beeps, which have not resolved with battery change.

"...6-8-21: After a month of installation, the chirping and irritating middle of the night noise were gone!..." Read more

"...The alarm itself is easy to test, push the big button, and the alarm is loud enough to get anyone's attention...." Read more

"Smoke detector started to randomly beep. Replaced battery and cleaned with no improvement...." Read more

"...This is an identical replacement. The alarm is piercing loud. Loud enough to wake you up from a bedroom with the door shut...." Read more

cheap batteries
4 Stars
cheap batteries
Good replacement unit but the batteries are cheap non alkaline types. Very disappointing.
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Top reviews from other countries

Amazon Customer
5.0 out of 5 stars Reliable product.
Reviewed in Canada on December 14, 2018
Brian Knott
5.0 out of 5 stars Compatible with my system
Reviewed in Canada on February 16, 2024
BlackeyedSue
4.0 out of 5 stars Backup replaceable battery is key
Reviewed in Canada on January 7, 2021
DanaS
5.0 out of 5 stars Fast delivery
Reviewed in Canada on August 9, 2019
Amazon Customer
5.0 out of 5 stars replacements fit perfect into older holder
Reviewed in Canada on December 21, 2018