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  • First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup, Single
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First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup, Single

622 customer reviews
| 19 answered questions

List Price: $23.99
Price: $12.21 & FREE Shipping on orders over $35. Details
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In stock on August 6, 2015.
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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 replacement and interconnectable up to 18 units
  • 10-year limited warranty
  • Loud 85dB alarm
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$12.21 & FREE Shipping on orders over $35. Details In stock on August 6, 2015. Order it now. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

First Alert BRK 9120B Hardwired Smoke Alarm with Battery Backup, Single + First Alert BRK SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup + First Alert 9120B6CP 120-Volt Wire-In With Battery Backup Smoke Alarm, 6-Pack
Price for all three: $105.12

These items are shipped from and sold by different sellers.

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Product Description

Introducing the revolutionary BRK 9120B 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. 10-year limited warranty. What's in the Box One smoke alarm, one 9-volt battery, and user's manual.

Product Information

Technical Details
Part Number 9120B
Item Weight11.2 ounces
Product Dimensions5.6 x 5.6 x 2.2 inches
Item model number9120B
Batteries:1 9V batteries required. (included)
Size1 Pack
ColorWhite
FinishNot Applicable
Item Package Quantity1
Batteries Included?Yes
Batteries Required?Yes
Average Battery Life8760 hours
Warranty Description10 Year Limited
  
Additional Information
ASINB00O8MVW3U
Best Sellers Rank #264 in Home Improvement (See top 100)
Shipping Weight11.2 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First AvailableOctober 3, 2014
  
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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

378 of 391 people found the following review helpful By Michael Epstein on September 5, 2008
Size: 1 PackPackage Type: Standard PackagingColor: 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.
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202 of 208 people found the following review helpful By Me on September 15, 2006
Size: 1 PackPackage Type: Standard PackagingColor: 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.
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109 of 115 people found the following review helpful By l0555 on December 17, 2007
Size: 1 PackPackage Type: Standard PackagingColor: 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.
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86 of 94 people found the following review helpful By Gregory Vandenham on March 16, 2009
Size: 1 PackPackage Type: Standard PackagingColor: 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.
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83 of 91 people found the following review helpful By J. Blanch on December 14, 2007
Size: 1 PackPackage Type: Standard PackagingColor: White
I am now up at 3:30 a.m. with my husband as we are disabling the 4th one of these that has gone off, chirping about once every minute. They typically all decide to go off in the middle of the night, waking us up. He climbs up on a ladder and tries to vacuum it out. It still chirps. He puts in a new battery, which according to instructions inside the alarm itself, is the reason for the chirping. It still chirps. At this point, you are screaming every expletive that comes to mind that early in the morning. You then take out the battery and unplug it because that is the only way to make it stop beeping. Yes, this means you have a smoke detector that no longer works. The other review that says this is a defective product is exactly right. Save yourself some money and a great deal of frustration and buy another brand. If representatives of the manufacturers read these reviews and do not fix the problem, they will be liable for punitive damages when homeowners who have disabled these smoke detectors die in a fire.
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67 of 73 people found the following review helpful By C. Caldwell on March 30, 2009
Size: 1 PackPackage Type: Standard PackagingColor: 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.
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