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  First Alert 3120B Hardwired Photoelectric and Ionization Combo Smoke Alarm with battery Backup
First Alert 3120B Hardwired Photoelectric and Ionization Combo Smoke Alarm with battery Backup


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The BRK First Alert 3120B is a dual sensing detection unit that utilizes both photoelectric and ionization sensors to detect a multitude of smoke types. The BRK First Alert 3120B photoelectric sensor is designed to identify larger smoke particles usually associated with smoldering flames, while the ionization sensor will detect fast flaming fires. The BRK First Alert 3120B will provide detection quickly and will serve as you first line of defense.  This state-of-the-art device has several indicators based on its recent activity; a alarm latch which exposes to identify that it is the imitating alarm (if interconnected to other devices), as well as a battery latch which will be exposed when a new battery is needed. The backup batteries (2 x AA) inside the BRK 3120B will provide additional power if needed during power loss.
The First Alert BRK 3120B meets all requires of UL217, CSFM, NFPA 72, HUD, FHA and other agencies requiring an AC/DC Hardwired photoelectric and ionization combination smoke alarm. In addition, the First Alert BRK 3120B incorporates BRK’s patented OptiPath technology designed to maximize effectiveness when mounted against a wall, or on a ceiling. The OptiPath technology allows for 360 degrees of detection.

Utilizes both ionization and photoelectric smoke sensors for maximum protection
Two Latching Features - Alarm Latch and Low Battery Latch
Two Silence Features - Alarm Silence and Low Battery Silence
Two AA Battery Backup
Optipath 360 Technology
10-Years Limited Warranty
Model # 3120B
Weight 9.5 oz
Dimension 5.0" dia x 2.0"H
Operating Voltage 120V AC 60Hz w/ two 1.5V AA battery backup
Operating Current 0.07 amps (standby/alarm)
Temperature Range 40°F (4°C) to 100°F (38°C)
Humidity Range 10% to 90% relative humidity (RH)
Audio Alarm 85dB at 10 feet
Test/Silence Electronically simulates smoke condition, causing the unit to alarm Press and hold test/silence button
Alarm Reset Automatic when smoke clears
Interconnections Up to 18 units of First Alert or BRK Smoke, CO and Heat Alarms. Maximum of 12 smoke alarms. See user's manual for details.
Smoke Sensor Photoelectric and Ionization
Indicator Lights/Sounds
AC Power: Constant Green LED
DC Power: Intermittent Green LED
Local Alarm: Red LED flashes rapidly
Remote Alarm: Red LED out.
Alarm Latch: LED flashes red 2 sec on, 2 sec off after local alarm stops
Low Battery Latch: LED flashes green 2 sec on, 2 sec off

Average Rating: 5 of 5 | Total Reviews: 60 Write a review »

  0 of 0 people found the following review helpful:
Best prices, great customer service December 15, 2014
Reviewer: Thomas Bee from LEWIS CENTER, OH United States  
Products work and shopping experience was top notch.

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  0 of 0 people found the following review helpful:
I feel safer! November 28, 2014
Reviewer: William Wilson from Hudson, NH United States  
Upgraded all the smoke detectors in our house to these and I feel safer already. Easy to install. I would recommend this model to anyone.
Thank you!!

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  0 of 0 people found the following review helpful:
more than expected November 26, 2014
Reviewer: Lorie York from LAS VEGAS, NV United States  
The boxes came with dust covers, wiring for your home if your home did not already have the correct plug insert into the fire alarm, batteries and the alarm with ceiling plate.  It took five minutes to  install a new one because the old wiring was compatible with the new alarm. All you do is prep the new alarm by inserting the batteries,twist the old one off,  unseat the plugged in wiring and pull it off the old alarm, unscrew the ceiling plate screws just enough to twist the plate off via the wholes. Put the new ceiling plate in, if the old one doesn't work with the new alarm. Tighten the screws, plug in the new alarm, twist the new alarm into place and then test it. Finished. The free shipping was reasonably quick and the prices were the best out there.

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  0 of 0 people found the following review helpful:
Excellect products and service. Thank you. November 26, 2014
Reviewer: Lloyd from Poulsbo, WA United States  
I never submit reviews but I am making an exception in this case.  SmokeAlert provided me with such excellent service, well packaged and rapid shipping of my order that I felt compelled to comment on their excellent service and great prices.  I am completely satisfied and will recommend SmokeAlert to my friends.

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  0 of 0 people found the following review helpful:
First Alert 3120B Hardwired Photoelectric and Ioni November 19, 2014
Reviewer: Parkview HOA from Park City, UT United States  
We are a Condo HOA.
Installed just under 200 combo Photoelectric/Ionisation hard wired smoke detectors. They replaced our First Alert Hard Wired Ionisation smoke detectors which had run their lifecycle.
Photoelectic/Ionisation combo works well.
The photoelectric has gone off in several units as a result of flash fire in the kitchen.
The only complaint I got was that the noise from the connected detectors drove everyone outside!!
I consider that a win.
The old ionisation only detectors would not have gone off until there was smoke.


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