12 Pack Bundle of First Alert Hardwired Smoke Alarm with Battery Backup - 9120B

  • 12 Pack Bundle of First Alert Hardwired Smoke Alarm with Battery Backup - 9120B
  • 12 Pack Bundle of First Alert Hardwired Smoke Alarm with Battery Backup - 9120B
  • 12 Pack Bundle of First Alert Hardwired Smoke Alarm with Battery Backup - 9120B
  • 12 Pack Bundle of First Alert Hardwired Smoke Alarm with Battery Backup - 9120B
  • 12 Pack Bundle of First Alert Hardwired Smoke Alarm with Battery Backup - 9120B
Ionization Wired In Smoke Detector
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Hardwired Smoke Alarm with Battery Backup:

Designed to help promote household safety, the First Alert 9120B Hardwired Smoke Alarm with Battery Backup can provide a vital early warning of fire. This hardwired smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast-flaming fires.

Ionization Sensor Reliably Detects Flaming Fires

The First Alert 9120B Hardwired Smoke Alarm with Battery Backup comes equipped with an ultra-reliable ionization sensor to provide the earliest possible warning of a fast-flaming fire. The sensor is optimized to detect flaming fires, such as those caused by paper, kitchen grease, and other fast-combusting materials.

Gasket-less for Easy Installation

To facilitate hassle-free installation, this smoke alarm features a streamlined mounting system with a gasket-less base. The mounting bracket keeps the alarm secure over a wide rotation range while maintaining perfect alignment. The alarm also comes with a dust cover to keep the unit clean during construction. AC-powered smoke alarms must be installed in accordance with all local electrical codes.

Battery Backup for Detection During a Power Outage

This smoke alarm is designed for hardwired installation, but it also features a battery backup that helps ensure continued functionality in the event of a power outage. The unit comes with a 9-volt battery and features a pivoting, easy-to-access battery drawer that allows you to replace the battery without dismounting the alarm.

Works in Tandem with Other First Alert Alarms

In addition to functioning independently, this smoke alarm can also integrate with up to 12 other First Alert or BRK hardwired alarms for coverage of larger spaces. It also integrates with up to six other compatible devices, such as bells, horns, and repeaters. If one alarm in the series is triggered, they will all sound. The alarm features a latching indicator to identify which unit triggered the alarm, alerting you to the area of danger.

First Alert Smoke Alarm 9120B

Recommended replacement for the following obsolete models:

BRK 4120B
BRK 4120SB
BRK 86RAC
First Alert SA4120B
First Alert SA4121B
First Alert SA4919B

Hardwired Smoke Alarm with Battery Backup Features:

  • Ionization smoke sensor is optimal for detecting fast flaming fires.
  • Loud 85dB alarm.
  • Tamper resistant locking pins.
  • Single button silence/test.
  • 120V AC power with 9V battery backup (included) to keep alarm functioning during power outage.
  • Open mounting design for easy installation with side load battery compartment for quick replacement.
  • Interconnectable up to 18 units (12 smoke, 6 CO/heat/relay).
  • Emits T3 Pattern.
  • 10 Year Limited Warranty.
  • Product Dimensions (LxWxH): 5.6 x 1.9 x 5.6 in.
  • Product Weight: .60 lbs.
Product Specs
UPC:
029054015327
MPN:
9120B
Write A Customer Review Review

5

Average score based on 416 reviews

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5

Reviewed: 07/15/2020 by Beverly London

Product was easy to install and the correct match to previous smoke alarms. Product was delivered very quickly.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Easy replacement.

Reviewed: 07/15/2020 by Stephen Dyleski

My detectors were 10 years old. I ordered from the First alert store. I waited a few weeks because they were on back order. They arrived and I replaced all 3 in 15 minutes with no problem. I saved a lot compared to local retail prices.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Smoke Detectors

Reviewed: 07/14/2020 by Robert Dobesh

Very good price for six detectors. Replaced every one in the house for less than $10 apiece. Had all replaced in about 20 min. Very good deal.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Mhm order

Reviewed: 07/14/2020 by marshall moore

Items worked well easy install.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Excellent quality

Reviewed: 07/14/2020 by Marvin Boyd

The product was excellent quality for the price. I looked in stores for the product and could not find it. Then it found First Alert on the web and glad I did.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5

Reviewed: 07/01/2020 by Chuck Laslie

EASY TO INSTALL- VERY HAPPY

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Easy Replacement

Reviewed: 06/19/2020 by Dianne Ormond

My previous First Alert Smoke Alarm with Battery Backup had finished its lifespan, and it was time to be replaced. I was pleased with how easy this new arrival replaced the old. Just disconnect the wire plug and plug into the new one, and rotate into the collar until it locks. Everything fit, and it was fast and easy.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Installtion

Reviewed: 06/19/2020 by Kelly Becker

Easy to relace old ones with new one, only had to screw in bracket and plug new one in. Very easy.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5First Alert Satisfied

Reviewed: 06/19/2020 by Terrell Moore

Very satisfied with your product.easy install Thx.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Fresh Stock

Reviewed: 06/10/2020 by david tamura

I ordered three 9120B ionization smoke alarms from firstalertstore.com. They were shipped very quickly by USPS Priority Mail. The items were fresh stock, manufactured only two months earlier. I ordered an additional three First Alert Photoelectric smoke alarms 7010B from Amazon because their price was lower than the firstalertstore.com. These were very slow in arriving and were made over two years ago. First Alert has told me that even though these are over two years old, if they have never been activated, their useful service life will not be affected. I hope so. Otherwise, next time I will order all my replacements directly from First Alert.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5So far so good.

Reviewed: 06/09/2020 by Kelly Becker

Looks good, easy installation, so far so good.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Works Great!

Reviewed: 06/09/2020 by Amy Jackson

These were bought to replace the same model but just 10 years older. We did have to replace the bracket to get these to fit but it wasn't hard. 6 of these went up in about 30 minutes. the existing wiring just plugged right in. No more late night chirping and false alarms!

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5GREAT REPLACMENT

Reviewed: 06/09/2020 by JACK HERRING

I was pleased to find the exact replacement smoke alarm model that had been in my house for 14 years. The smoke alarm even attached to the old mounting bracket which made for a very easy install. The item was received fast. I would use this company again. Very pleased with their customer service.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5

Reviewed: 06/09/2020 by sandra williams

Received early everything is great

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5New Smoke Detectors

Reviewed: 06/05/2020 by Donald Souza

Great service. Quick delivery.

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Q: What is the proper placement of smoke alarms?
A: It is important that you have the proper placement for your smoke alarms. Install your alarms at least 20 feet from appliances like furnaces and ovens, which produce combustion particles. Alarms should be at least 10 feet from high humidity areas like showers and laundry rooms, and at least 3 feet from heat/AC vents. Be sure to install a smoke alarm in each bedroom, one at the top of each stairwell, and one on every level.

Q: Why doesn't my smoke alarm sound when I push the test button?
A: It is important that you frequently test your smoke alarms. When you are testing your smoke alarm, there are a number of reasons why the alarm might not sound:
  • You may not be holding the test button down long enough. Try holding it down for up to 10 seconds (20 seconds on photoelectric models) .
  • Your battery may not be installed properly or snapped all the way in place. Even if the alarm sounded briefly when the battery touched the terminals, you still need to make sure it is snapped securely in place. If the battery is loose, in cannot power the smoke alarm properly. After installing new batteries, be sure to test your smoke detector.
  • Your AC power may not be on. AC and AC/DC units will have a power indicator light (red or green) that shines continuously when they are receiving electrical power.
  • If you have a 10-Year model, the smoke alarm may not have been properly activated. If the tab broke away before the alarm was activated, you can use a toothpick to move the switch over to test the alarm.

Q: Why does my smoke alarm go off when I install a battery or turn on the AC power?
A: It is normal for smoke alarms to go off and sound briefly (up to 5-10 seconds) when you install a new battery or when they are powered up. If the alarm continues to go off and no smoke is present, the cause may be one of the following:
  • There may be insufficient battery power, try new batteries.
  • Problems with voltage or insufficient electrical power (brown out) may cause a continuous weak sounding alarm. For AC or AC/DC models, temporarily disconnect power at the service panel until the brown out is over. If you do not restore the AC power, your smoke alarms cannot warn you of a fire.
  • Incompatible warning device. If an incompatible alarm or auxiliary device is linked into a series of AC or AC/DC smoke alarms it may cause the system inadvertently go off.

Q: I lost my First Alert smoke alarm owner's manual. How can I get a new one?
A: First Alert smoke alarm owner's manuals are available online for download at no cost. Find your alarm in our Smoke Alarms section.

Q: Why does the National Fire Protection Association (NFPA) recommend that home smoke alarms be replaced after 10 years?
A: Smoke alarms have a limited life. Although each smoke alarm and all of its parts have passed many stringent tests and are designed to be as reliable as possible, any of these parts could fail over time. Therefore, you must test the devices weekly. The unit should be replaced immediately if it is not operating properly. The performance of smoke alarms older than 10 years is simply not reliable. To ensure your family's safety, all carbon monoxide and smoke/CO combination alarms need to be replaced every 5-7 years. All smoke alarms need to be replaced every 10 years.


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