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BRK Brands 9120B Hardwired Smoke Alarm with Battery Backup, Single Individual from Contractor Pack

4.7 out of 5 stars 552 customer reviews
| 42 answered questions

Price: $9.48 + $2.99 shipping
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  • Tamper resistant locking pins, single button silence/test, and loud 85dB alarm
  • 120-volt AC power with 9-volt battery backup (included) to keep alarm functioning during power outage
  • Open mounting design for easy installation with side load battery compartment for quick replacementv and interconnectable up to 18 units (12 smoke, 6 CO/heat/relay)
  • 10-year limited warranty
30 new from $8.59

Frequently Bought Together

  • BRK Brands 9120B Hardwired Smoke Alarm with Battery Backup, Single Individual from Contractor Pack
  • +
  • First Alert BRK SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup
Total price: $42.68
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Color Name: White
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Product Information

Color Name:White

Technical Details

Part Number 9120B
Item Weight 3.2 ounces
Product Dimensions 5.7 x 5.7 x 2.2 inches
Item model number 9120B-12ST
Batteries 1 9V batteries required.
Size 1 Pack
Color White
Finish White
Material Synthetic
Power Source battery-powered
Item Package Quantity 1
Number Of Pieces 1
Number Of Holes 1
Batteries Included? No
Batteries Required? No

Technical Specification

Additional Information

ASIN B000BD8NTQ
Customer Reviews
4.7 out of 5 stars 552 customer reviews

4.7 out of 5 stars
Best Sellers Rank #4,919 in Home Improvements (See top 100)
#21 in Home Improvement > Safety & Security > Fire Safety > Smoke Detectors & Fire Alarms
#62 in Home Improvement > Safety & Security > Household Sensors & Alarms
Shipping Weight 8.8 ounces (View shipping rates and policies)
Date First Available August 17, 2005

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From the Manufacturer


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By Michael Epstein on September 5, 2008
Color: White
Most reviewers report random chirping. In my case, I replaced the battery and couldn't get it to stop chirping every minute, until I found this advice elsewhere on the web:

1. Unplug detector from power (or flip circuit breaker)
2. Remove battery
3. Hold down Test button for 20 seconds
4. Replace battery
5. Turn power/breaker back on

This stopped mine from chirping every minute. Give it a try on yours.
72 Comments 452 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Color: White
I bought this unit to replace a prior model that was no longer available. It's installed in tandem with other smoke alarms as was its predecessor. It's less than a year old.

Since new, every few random months the unit chirps a random number of times at a random hour of the day - sadly, all but once at dark o'clock, waking up our little tykes. I've replaced backup batteries that test like new on my voltmeter, with new ones that also test positive, to no avail. None of the other units in tandem exhibit a problem. All units, including this one, work as designed when running periodic tests. The unit is neither dirty nor dusty. And I know it works in smokey conditions as my wife occasionally proves by talking on the phone and cooking at the same time.

It's just the kind of thing that makes you want to do something dumb like disable it.
27 Comments 230 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Color: White
I replaced all 9 smoke alarms in my house with the BRK2190B in about 20 minutes. The only reason I did not give it 5 stars is that the old ones were BRK (about 8 years old) that were starting to give false alarms (naturally at 2 or 3 in the morning). I have had them for a couple of weeks with no issues. The old ones did not indicate which unit had failed and was hard to trouble shoot). I had removed four of the 9 in the last year. All 9 of the new ones worked, and I had no issues. Only time will tell if I made the correct choice, but at least the BRK2190B will show me which unit caused the alarm. I have talked with other people with other alarms, and they all seem to have false alarms, so I am hoping the new ones work better. I admit I have not maintained them according to the manufacturer instructions, but who cleans them every month and test them every week.
2 Comments 116 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Color: White
You will be sleeping. Then you'll be dreaming about a little bird chirping occasionally on your windowsill. Then the bird will become annoying. Then you'll be awake and realize that the bird is your BRK 9210B Hardwired Smoke Alarm with Battery Backup. It has woken up your entire family. You will attempt to reset it. It will continue to chirp. You will replace the battery with a fresh one. It will continue to chirp. (The next day you will test the old battery and discover that it's still perfectly good.) You will disconnect the offending smoke alarm and it will continue to chirp until the last bit of power drains from is useless plastic body. You will try to go back to sleep, but will lay awake in bed ...praying that nothing catches fire. The next day you will write one of scores of 1-star Amazon reviews of this piece of garbage.
2 Comments 41 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Color: White
I took the advice of another reviewer and replaced all of my existing BRK 910B smoke alarms with Kidde-Hardwire Replacement-Model # i2060 (P/N 21007397) smoke alarms. I purchased these from Home Depot for $15.97 each. These alarms comes with adapters for BRK hardwired smoke alarm, that can be quickly connected to the existing BRK hardwired connector in your ceiling or wall. These alarms needs to be replace every 10 years instead of 5 years and they come with a front battery door with a hush button. We replaced all of ours last week and haven't heard a beep from any of them yet! A great replacement alarm that you can purchase from your local Home Depot or online. Thanks to the 3/16/09 reviewer for this advice.
4 Comments 76 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Color: White
I was very happy to notice that some Kidde smoke detectors came with a wiring harness adapter that plugs into your current BRK wiring and retrofits them to the Kidde Adapter.

I actually didn't realize that was possible until I went to Home Depot to check it out. Kidde actually made the swap out a no brainer after reading all the bad reviews associated with BRK.

The detectors I went with were Kidde 120 Volt Front Load Battery Smoke Alarm. I also got their CO/Smoke combo alarm that happened to have Voice Announcements to indicate what the problem was beyond the tone. The CO/Smoke Detector didn't have the adapter but it only took 5 minutes to rewire the connection. Our current building code require a CO detector in the home. Kidde detectors are a little more expensive but they all have hush buttons and tell you which detector went off. Their battery replacement doors are also really nice and warranty is 10 years instead of 5. You'll note the BRK detector says replace by on it and that date is always 5 years from manufacture. So Kidde's maybe twice the cost (at ~$15), but they last twice as long.

I have 3 new detectors in total that are working perfectly so far. The reason for the swap out was that my old BRK detectors went faulty on me - They went off for 5 hours while I was at work. My poor house pets were clearly pissed off / shell shocked when I got home. I was not happy and the only way to silence them was to pull all 3 from the hard wire connection and remove their batteries to reset/silence them.

Thanks to all the other Amazon reviewers for saving me from installing BRK again. Your reviews led me to spend the time I needed to get a better product.
8 Comments 95 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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