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First Alert BRK 3120B Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup, Dual Sensing Smoke Alarm, 1-Pack

4.4 4.4 out of 5 stars 2,429 ratings

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1-Pack
Hardwired

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About this item

  • The front cover design of the alarm may vary but product function remains the same.
  • The First Alert Hardwired Dual Sensor Photoelectric and Ionization Smoke Alarm with Battery Backup is designed to help provide peace of mind.
  • This dual sensor, photoelectric and ionization alarm alerts you to both smoldering and fast-flaming fires in the event of a home fire emergency.
  • Hardwire alarm includes battery backup for protection during power outages.
  • Two latching features help indicate a low battery or the originating alarm in a system.
  • A single test button makes alarm easy to test regularly.
See more product details

Customer ratings by feature

Instruction quality
4.4 4.4
Easy to install
4.3 4.3
Battery life
4.0 4.0
Value for money
3.8 3.8

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From the manufacturer

First Alert
Super Prepared Family

Smoke

Carbon Monoxide

Extinguishers

Escape Ladders

Smoke Alarms

Place at least 10 feet from kitchen/stove, and on the ceiling or high on a wall, no more than 10 inches from top.

Carbon Monoxide Alarms

Carbon monoxide alarms can be placed anywhere, not just the ceiling or high on a wall. They should be replaced every 5 to 7 years.

Fire Extinguishers

Keep in the kitchen and garage, but make sure to have the right grade for the type of fire that might occur.

Escape Ladders

Have at least one if your home has more than one story. Each room needs 2 escape routes; in most bedrooms it's the window, so have a ladder nearby.

Recommended Placement

Product guides and documents

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Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here [PDF ]

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First Alert BRK 3120B Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup, Dual Sensing Smoke Alarm, 1-Pack


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Product Description

The First Alert Model No. 3120B is a wire in, 120V AC 60Hz single and/or multiple station photoelectric and ionization dual sensor smoke alarm specifically designed for residential and institutional applications including sleeping rooms of hospitals, hotels, motels, dormitories and other multifamily dwellings as defined in standard NFPA 101. Model 3120B complies with UL217, CSFM, NFPA 72, HUD, FHA and other agencies that model their codes after the above agencies. It meets building codes where AC/DC photoelectric and ionization combination smoke alarms are required. The BRK 3120B is a state of the art hardwired with battery backup smoke alarm that features dual photoelectric and ionization smoke sensing technologies. This alarm features two latching features and two silence features. Alarm Latch: Easily identifies initiating alarm even after alarm condition has subsided. Low Battery Latch: Identifies which unit is in low battery condition by blinking the green power light. Low Battery Silence: Temporarily silence the low battery chirp for up to eight hours. Alarm Silence: Silence alarm for several minutes. Other features include an85dB horn, single button test/silence, an easy access battery drawer and dust cover. OptiPath 360 Technology: Exclusive patented technology provides 360 degrees of direct access to the smoke sensor. Two locking features are provided to prevent battery theft and/or theft of the unit. Connection to AC power is made with a Quick Connect wiring harness. Installation is quick, easy and cost effective.

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First Alert BRK 3120B Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup, Dual Sensing Smoke Alarm, 1-Pack
FIRST ALERT First Alert BRK 3120B Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup, Dual Sensing Smoke Alarm, 1-Pack
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Price-55% $26.00
List:$57.99
$81.12$69.99$88.99-12% $139.62
Typical:$157.79
-8% $44.23
Typical:$48.13
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Easy to install
4.3
4.6
4.7
4.4
4.3
4.4
Battery life
4.0
4.2
3.7
4.5
4.0
4.0
Value for money
3.8
4.4
4.2
3.8
3.8
3.8
Instruction quality
4.4
4.5
3.8
4.4
Sold By
Amazon.com
Amazon.com
WisTSLead
AmericaMart
Amazon.com
86 Percent Co
power source
Battery Powered
Hardwired
Battery Powered
Battery Powered
Battery Powered
Battery Powered
sensor type
Photoelectric
Ionization
Photoelectric
Photoelectric
Photoelectric
Dual Sensor
style
Hardwired
Hardwired Interconnect Smoke Detector
mini- 4p
Dual Sensing Smoke Alarm
Dual Sensing Smoke Alarm
Hardwired
alarm
Audible
fire safety, ionization, wired, interconnected, tamper-resistant
Audible
Visual
Audible
Audible
weight
0.6 pounds
0.7 pounds
0.7 pounds

Customer reviews

4.4 out of 5 stars
4.4 out of 5
2,429 global ratings

Customers say

Customers like the quality and ease of installation of the gas smoke fire alarm. For example, they mention it works great for a couple of years, has no known issues, and the instructions are clear. Some are happy with the dual sensor, appearance, and ease to replace. That said, opinions are mixed on false alarms, battery life, and volume.

AI-generated from the text of customer reviews

336 customers mention247 positive89 negative

Customers like the quality of the gas smoke fire alarm. They say it's easy to install and has no issues. Some mention that the adapters work like a charm and the build quality is better than other units. Overall, most are satisfied with the product's quality and value.

"...Second, I think the build quality on the First Alert model is better. The Kidde model was recalled a few years back due to a defect...." Read more

"Easy to install. Needed a replacement and this worked great. Comes with a hairnet." Read more

"...The TV make work fine, but if the VCR craps out – or vice versa, then you’re faced with a bit of a challenge, an also a..." Read more

"...One of these detectors arrived with a significant manufacturer's defect...." Read more

299 customers mention286 positive13 negative

Customers find the installation of the gas smoke fire alarm to be easy. They mention that the instructions are clear, the detector is easy to attach to the mounting plate, and the project was easier than anticipated. Some say that the product works properly after installation and that the location holes and mounting plate make placement easy.

"...Installing these was a snap even though we had to remove the old wiring harnesses from the USI detectors and replace them with the First Alert..." Read more

"Easy to install. Needed a replacement and this worked great. Comes with a hairnet." Read more

"...Installation was especially easy, since the BRK uses the same size mounting ring (and the quick connect cable) as the ones I am replacing...." Read more

"...Five of the items arrived perfect, and installed easily (but more info on an important installation detail below)...." Read more

53 customers mention53 positive0 negative

Customers appreciate the dual sensor in the gas smoke fire alarm. They say it provides the best protection and makes them feel much safer. Customers also mention that the dual detection is essential for best detection of fire.

"...expensive than other units, but it is well worth it for its dual detection capabilities: photo electric and ionization...." Read more

"Smoke alarms need to be replaced about every 10 years. These were highly rated. I installed 8 of them yesterday; everything went smoothly." Read more

"This model has the very best rating for smoke deteectors of all the units tested by Consumer Reports...." Read more

"...I really like the latch feature that makes it easy to identify which detector triggered an alarm or a low battery chirp...." Read more

47 customers mention40 positive7 negative

Customers like the appearance of the gas smoke fire alarm. For example, they mention it's nice, easy to install, and clean looking. Some say it'll be a great solution for their kitchen and that the CS was good.

"Looks good but have not yet used." Read more

"...We opted for First Alert / BRK and these are perfect and super easy to install. The dual sensor protection is clutch." Read more

"...They are nice and loud and I love the AA backup batteries vs the 9 volt, which I never seem to have on hand when it is time to replace old batteries...." Read more

"...enough to cover the electric box and - in my opinion - are the best looking units out there." Read more

42 customers mention42 positive0 negative

Customers find the replacement of the gas smoke fire alarm to be easy. They mention that it's simple to swap out the wiring harnesses, install new mounting plates, and plug them in. Some say that the detector is easy to replace and that the battery can be replaced easily.

"...It is actually easy to disconnect alarm base from power connector; one can practice first using the new base and new connector...." Read more

"...same wiring plugs as the old First Alert/BRK detectors, so no rewiring was necessary...." Read more

"...Very easy to swap out the wiring harnesses, install new mounting plates and plug them in...." Read more

"...This fit perfectly. Ours have an older plug which was easy to exchange out...." Read more

133 customers mention66 positive67 negative

Customers are mixed about the false alarms with some reporting zero false cooking alarms, while others say they started getting random false alarm.

"...No false alarms so far. I'd highly recommend this model." Read more

"...; described below worked for a few months, but then back to the random false alarms that last about 15 seconds and, of course, always happen in the..." Read more

"...No false alarms in a couple days. I like that they are hardwired and have a battery backup. I especially like the mounting ring...." Read more

"...Update after a year and a half: They all still work. BUT: Three false alarm events, for no apparent reason...." Read more

80 customers mention49 positive31 negative

Customers are mixed about the battery life of the gas smoke fire alarm. Some like that it uses AA backup batteries, which are much cheaper than the 9V, and are easier to find spares when it does have low. However, others say that the batteries drained despite being replaced recently. The included batteries were no good and bore an expiration date of 2022.

"...The batteries are also AA batteries, which are cheaper and what we typically have on hand, unlike 9V batteries which usually require a trip to the..." Read more

"...has now installed all 6 of these, but 1 unit is defective and needs to be replaced. Since the return window has closed we have no recourse...." Read more

"...I like that they are hardwired and have a battery backup. I especially like the mounting ring...." Read more

"...Comes with decent Duracell batteries but I tossed in some energizer lithium AAs before I put them up since I have a few high ceilings that are a..." Read more

57 customers mention20 positive37 negative

Customers are mixed about the volume of the gas smoke fire alarm. Some mention that it is very loud, while others say that it can be silenced for hours until the batteries can be replaced. Some customers also mention that the detector chirps for a low battery warning. Overall, the opinions are mixed and depend on the individual customer's experience.

"...The batteries it came with (Duracells with French writing on them) where chirping...." Read more

"...Several desirable features include silencing for the alarm and the low battery chirp, AA batteries used instead of 9V types for power backup, and..." Read more

"...We had an annoying low battery warning (one chirp per minute) on new batteries and a three-month-old unit, but went ahead and replaced them anyway -..." Read more

"...up batteries were inserted into the defective alarm, the loud alarm would not shut off...." Read more

Excellent product (but marred by one manufacturer defect) - and some interesting installation advice
4 Stars
Excellent product (but marred by one manufacturer defect) - and some interesting installation advice
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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Top reviews from the United States

Reviewed in the United States on January 16, 2020
Size: 1-PackStyle: HardwiredVerified Purchase
4 people found this helpful
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Reviewed in the United States on December 31, 2023
Size: 1-PackStyle: HardwiredVerified Purchase
Reviewed in the United States on February 7, 2017
Size: 1-PackStyle: HardwiredVerified Purchase
3 people found this helpful
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Reviewed in the United States on January 12, 2018
Size: 1-PackStyle: HardwiredVerified Purchase
Customer image
4.0 out of 5 stars Excellent product (but marred by one manufacturer defect) - and some interesting installation advice
Reviewed in the United States 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.
Images in this review
Customer image
Customer image
573 people found this helpful
Report