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

4.7 out of 5 stars 20,195 ratings

Price: $13.05 Get Fast, Free Shipping with Amazon Prime
1 Pack
Hardwired Alarm

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Brand FIRST ALERT
Style Hardwired Alarm
Power Source Battery-powered
Color White
Product Dimensions 5.6 x 5.6 x 2.2 inches; 0.8 Ounces
Sensor Type Ionization

About this item

    This fits your .
  • Make sure this fits by entering your model number.
  • 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
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Customer Rating 4.7 out of 5 stars (20195) 4.6 out of 5 stars (1763) 4.7 out of 5 stars (4866) 4.6 out of 5 stars (13357) 4.8 out of 5 stars (968) 4.7 out of 5 stars (193)
Price $13.05 $12.83 $17.42 $7.67 $16.31 $19.10
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Product description

Size:1 Pack  |  Style:Hardwired Alarm

Product Description

Promote greater household safety with the First Alert 9120B 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

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Product information

Size:1 Pack  |  Style:Hardwired Alarm

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Bulb Voltage

120 volts


Customer Questions & Answers

Customer reviews

4.7 out of 5 stars
4.7 out of 5
20,195 global ratings
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Top reviews from the United States

Reviewed in the United States on January 12, 2018
Size: 1 PackStyle: Dual Sensing Smoke AlarmVerified Purchase
Customer image
4.0 out of 5 stars Excellent product (but marred by one manufacturer defect) - and some interesting installation advice
By Ralph B on January 12, 2018
There's good news and bad news about this product. (Detailed review ahead.)
This product is highly rated by the leading consumer testing magazine. And it's priced competitively on Amazon.
I ordered 6 of these, and all arrived promptly, packed together, but in individual smaller boxes, all well cushioned.
Five of the items arrived perfect, and installed easily (but more info on an important installation detail below).

One of these detectors arrived with a significant manufacturer's defect. See the attached photo for a clear illustration of the defect, which made this detector uninstallable. The electrical pins inside the device were improperly positioned. This defect also interfered with the opening/closing of the battery door on the new detector. Amazon handled the exchange promptly and courteously.

Now, about the installation of the OK units: There's also good news and bad news.
Good news: The connecting pigtails included with the new First Alert smoke detectors are identical to the pigtails in my 10-year-old First Alert same-model detectors, which these are replacing. That means it was not necessary to un-wire and re-wire new pigtails into their wall boxes before replacing each detector. I was able simply to disconnect the old pigtail from the old detector and plug it into the new detectors. Easy! And safe!

Bad news: First Alert has very SLIGHTLY modified the round plastic mounting base for the new units, compared to their own 10-year-old design. This means I had to remove the old mounting base and replace it with the new one. It's an easy step, no problem. But because the new mounting base has a smaller diameter (a "trimmer" design), the new bases expose a ring of unpainted/unwalpapered wall/ceiling surface, which requires patching. First Alert has ALSO SLIGHTLY modified the turnscrew plastic locking design of the detector, so it no longer secures completely to the 10-year-old design. This, also, means the old mounting bases cannot simply be left in place, with the new detectors simply attaching to them.
In a couple of highly-visible and not-easily-patched wallpaper locations, I decided to leave the old mounting bases in place anyway (preserving the wallcovering's appearance), and discovered that the new detectors ARE able to hang fairly securely (but not perfectly) on the old bases. This is an imperfect workaround, but it DOES work, especially since the detectors are in no danger of falling off the wall (they're hardwired, electrically). Using this method will require a bit of care (a two-handed job) when changing batteries annually, to avoid pulling the detectors off their mounts. But it's not difficult.

A final note: Regardless of whether these detectors are attached to their OLD mounts or to the NEW ones, the distinction is invisible from below. In fact, the wallcovering issue with the new, trimmer bases is more noticeable than the new detectors attached to the old mounts.
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545 people found this helpful
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Reviewed in the United States on July 1, 2018
Size: 6 PackStyle: Hardwired AlarmVerified Purchase
235 people found this helpful
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Reviewed in the United States on December 22, 2018
Size: 1 PackStyle: Dual Sensing Smoke AlarmVerified Purchase
143 people found this helpful
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Reviewed in the United States on May 9, 2017
Size: 1 PackStyle: Dual Sensing Smoke AlarmVerified Purchase
277 people found this helpful
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