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First Alert Hardwired Smoke Alarm with Battery Backup, 9120B

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

AVAILABILITY: In Stock
Regular Price: $19.99
Price: $12.99
You Save: $7.00
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Hardwired Smoke Alarm with Battery Backup

First Alert's 120VAC Hardwired Smoke Alarm works exceptionally well in detecting flaming fires. Capable of wiring directly into your home's electrical system, these alarms feature a near effortless installation process. This Alarm comes equipped with a Mute Button that serves the dual purpose of quickly silencing your alarm as well as testing its function.

First Alert's s 120VAC Hardwired Smoke Alarm also comes equipped with an EZ access battery door that removes the hassle and burden of collecting your alarm from the ceiling and replacing its batteries. The combination of a Battery Backup that provides optimal protection in the event of a power outage and an increased emphasis on the unit's 85d output establish the ultimate in peace of mind. This alarm comes with a 10 year limited warranty and complies with UL217 Standards. Save additionally with the purchase of this bundle.

These alarms are also capable of interconnecting with up to 18 other First Alert or BRK hardwired alarms.


This smoke & fire alarm is for you if:
You want alarms wired directly into your home's electrical system with the added safety of a battery backup.
You want to install more than one alarm.

Where To Place Safety Smoke Alarms: One in every bedroom, and at least one on every level of the home.
First Alert Smoke Alarm 9120B6CP


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:

  • 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).
  • 10 Year Limited Warranty.
  • Emits T3 Pattern.
Click Here to Write a Review for this Product. Review

Average Customer Rating Based on 19 reviews: Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Pleased with product and service - 03/14/2017
Reviewer: Kurt Eddy
The person that took my order was knowledgeable and kind. The products arrived quickly. I was motivated to replace my alarms due to a house fire in my region and that killed three children.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Review of 9120B Alarm - 02/21/2017
Reviewer: RET CW4 Owen McDaniel
The item was the exact replacement as need. Worked properly and easy to install.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Smoke Detector - 01/27/2017
Reviewer: BR
This smoke detector is better then the Kidde product I used to have, when I sometimes over cook foods this alarm goes off quickly, the older Kidde product took a while to activate. I'd recommend this smoke detector to anyone who is looking to upgrade their units.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 01/26/2017
Reviewer: William Sydnes
Good price - very easy to install and works great. I installed a LONG life battery Vs the one which came with it.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 Wired smoke alarm - 01/06/2017
Reviewer: Michele Chapman
This was a replacement. Easy installation. Works great.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 9120B Smoke Alarms - 01/05/2017
Reviewer: Mark Toussaint
Arrived quickly, easy install, all 7 work great


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 protected again - 01/04/2017
Reviewer: douglas wiseman
Replaced 6 hard wired smoke alarms-product as described. Easy replacement. Good price and quick delivery.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 12/20/2016
Reviewer: thomas  cychosz
Order was filled and delivered quikly


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 12/16/2016
Reviewer: Michael COFFEY
Unit replaced smoke alarms which were older than 10 years. They are hardwired into the electrical system. Test as good.


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5 - 11/14/2016
Reviewer: Francine  Finn
Received quickly. Fit as technician indicated. Would use company again.


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