$37.32
FREE delivery Friday, May 17
In Stock
$$37.32 () Includes selected options. Includes initial monthly payment and selected options. Details
Price
Subtotal
$$37.32
Subtotal
Initial payment breakdown
Shipping cost, delivery date, and order total (including tax) shown at checkout.
Ships from
Amazon
Ships from
Amazon
Sold by
AmericaMart
Sold by
AmericaMart
Returns
Non-returnable due to hazmat safety reasons
Non-returnable due to hazmat safety reasons
This item is non-returnable due to its composition that makes it regulated for transportation, but if the item arrives damaged or defective, you may request a refund or replacement.
Read full return policy
Returns
Non-returnable due to hazmat safety reasons
This item is non-returnable due to its composition that makes it regulated for transportation, but if the item arrives damaged or defective, you may request a refund or replacement.
Read full return policy
Packaging
Ships in product packaging
black leaf Ships in product packaging

This item has been tested to certify it can ship safely in its original box or bag to avoid unnecessary packaging. Since 2015, we have reduced the weight of outbound packaging per shipment by 41% on average, that’s over 2 million tons of packaging material.

If you still require Amazon packaging for this item, choose "Ship in Amazon packaging" at checkout. Learn more
Packaging
black leaf Ships in product packaging

This item has been tested to certify it can ship safely in its original box or bag to avoid unnecessary packaging. Since 2015, we have reduced the weight of outbound packaging per shipment by 41% on average, that’s over 2 million tons of packaging material.

If you still require Amazon packaging for this item, choose "Ship in Amazon packaging" at checkout. Learn more
Payment
Secure transaction
Your transaction is secure
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more
Payment
Secure transaction
We work hard to protect your security and privacy. Our payment security system encrypts your information during transmission. We don’t share your credit card details with third-party sellers, and we don’t sell your information to others. Learn more
Add an Accessory:
Amazon Basics 9 Volt All-Purpose Batteries
$12.57
Added to Cart

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 2,452 ratings
$37.32 with 36 percent savings
List Price: $57.99

The List Price is the suggested retail price of a new product as provided by a manufacturer, supplier, or seller. Except for books, Amazon will display a List Price if the product was purchased by customers on Amazon or offered by other retailers at or above the List Price in at least the past 90 days. List prices may not necessarily reflect the product's prevailing market price.
Learn more
1-Pack
Hardwired
{"desktop_buybox_group_1":[{"displayPrice":"$37.32","priceAmount":37.32,"currencySymbol":"$","integerValue":"37","decimalSeparator":".","fractionalValue":"32","symbolPosition":"left","hasSpace":false,"showFractionalPartIfEmpty":true,"offerListingId":"8xDcLnw8AFwUc%2B6y8TysQGx8jPlIJxWdeHf6Lqricj9bcJk0kZZUhbM3k1%2Fb2MlhHyTIgRZsucVpeX64dtvNp9e1Z1OHOnzHmR4gZeoGALxgFTHzLUZjPAUIl3xGdQrsmSI6VdhdyTXsosr7jW4Ewzl2OCVmni7AqB3%2FfXJNRYSfWjLWxcAW6CM2dtyDPKbA","locale":"en-US","buyingOptionType":"NEW","aapiBuyingOptionIndex":0}]}

Purchase options and add-ons

Brand FIRST ALERT
Style Hardwired
Power Source Battery Powered
Color Dual Sensing Smoke Alarm
Product Dimensions 2"D x 5.25"W x 5"H
Alarm Audible
Compatible Devices photoelectric
Upper Temperature Rating 38 Degrees Celsius
Sensor Type Photoelectric

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
See all reviews
Add a debit or credit card to save time when you check out
Convenient and secure with 2 clicks. Add your card

Frequently bought together

First Alert BRK 3120B Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup, Dual Sensing Smoke Alarm, 1-Pac
$37.32
Get it as soon as Friday, May 17
In Stock
Sold by AmericaMart and ships from Amazon Fulfillment.
+
FIRST ALERT BRK 3120B-3 Hardwired Smoke Detector with Photoelectric and Ionization with Battery Backup, 3-Pack
$88.99
Get it as soon as Friday, May 17
In Stock
Sold by AmericaMart and ships from Amazon Fulfillment.
+
First Alert BRK SC7010B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup , White
$46.49
Get it as soon as Thursday, May 16
In Stock
Ships from and sold by Amazon.com.
Total price:
To see our price, add these items to your cart.
Details
Added to Cart
These items are shipped from and sold by different sellers.
Show details Hide details
Choose items to buy together.

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 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 ]

Feedback

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

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

Found a lower price? Let us know. Although we can't match every price reported, we'll use your feedback to ensure that our prices remain competitive.

Where did you see a lower price?

Fields with an asterisk * are required
/
/
/
/
Please sign in to provide feedback.

Product guides and documents

User Manual (PDF)

Looking for specific info?

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.

Compare with similar items

This Item
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
Recommendations
First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack
FIRST ALERT First Alert SMI105-AC, Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup, 1-Pack
dummy
Smoke Detector
SITERWELL Smoke Detector
dummy
First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 1-Pack
FIRST ALERT First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 1-Pack
dummy
FIRST ALERT BRK 3120B-3 Hardwired Smoke Detector with Photoelectric and Ionization with Battery Backup, 3-Pack
FIRST ALERT BRK 3120B-3 Hardwired Smoke Detector with Photoelectric and Ionization with Battery Backup, 3-Pack
dummy
FIRST ALERT BRK 3120B-6 Hardwired Smoke Detector with Photoelectric and Ionization with Battery Backup, 6-Pack , White
FIRST ALERT BRK 3120B-6 Hardwired Smoke Detector with Photoelectric and Ionization with Battery Backup, 6-Pack , White
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Details
Added to Cart
Price-36% $37.32
List: $57.99		$31.01$69.99$64.99$88.99$155.00
Delivery
Get it as soon as Friday, May 17
Get it as soon as Thursday, May 16
Get it as soon as Thursday, May 16
Get it as soon as Thursday, May 16
Get it as soon as Friday, May 17
Get it as soon as Thursday, May 16
Customer Ratings
4.44.4 out of 5 stars2,452
4.64.6 out of 5 stars30
4.04.0 out of 5 stars21
4.54.5 out of 5 stars30
4.64.6 out of 5 stars214
4.44.4 out of 5 stars2,452
Easy to install
4.3
—
4.7
—
4.4
4.3
Battery life
4.0
—
3.7
—
4.6
4.0
Value for money
3.8
—
4.2
—
3.9
3.8
Instruction quality
4.4
—
—
—
3.8
4.4
Sold By
AmericaMart
Amazon.com
WisTSLead
Amazon.com
AmericaMart
Amazon.com
power source
Battery Powered
Corded Electric
Battery Powered
Corded Electric
Battery Powered
Battery Powered
sensor type
Photoelectric
Ionization
Photoelectric
Ionization
Photoelectric
Photoelectric
style
Hardwired
Smoke
mini- 4p
Smoke, CO
Dual Sensing Smoke Alarm
Dual Sensing Smoke Alarm
alarm
Audible
Smoke
Audible
Smoke, CO
Visual
Audible
weight
—
0.7 pounds
—
0.56 pounds
0.7 pounds
0.7 pounds

Customer reviews

4.4 out of 5 stars
4.4 out of 5
2,452 global ratings

Customers say

Customers like the appearance, quality and dual sensor of the gas smoke fire alarm. For example, they mention it's the best looking units out there, works great for a couple of years and has dual detection for the best fire protection. That said, opinions are mixed on battery life, volume and false alarms.

AI-generated from the text of customer reviews

348 customers mention253 positive95 negative

Customers like the quality of the gas smoke fire alarm. They say it works great for a couple of years, has no issues, and is well worth the price for its dual detection. Some mention that the adapters work like a charm and the build quality on the First Alert model is better.

"...Weird. I installed five of them very quickly and they all work just fine. No false alarms in a couple days...." Read more

"...They’re up now and working properly." Read more

"...sure what happened but even taking the battery out it still kept going off every hour or so...." Read more

"...2. All of the units seem to function correctly and were packed well.3...." Read more

300 customers mention288 positive12 negative

Customers find the installation of the gas smoke fire alarm to be easy. They mention the instructions are clear, and the project was easier than anticipated. Some say that the location holes and the installation process went smoothly.

"SO easy. matched my other dectors and was even able to use the old base and wiring...." Read more

"...You use wirenuts to wire in the new connector. Easy enough but turn off power first, it's 120 VAC." Read more

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

"...3. The instructions were very clear and comprehensive, but the print is very small and hard for older eyes to read.Cons:1...." Read more

53 customers mention53 positive0 negative

Customers appreciate the dual sensor in the gas smoke fire alarm. They say it provides the best fire protection with dual detection. Some customers also mention that the combination of sensors makes them feel much safer.

"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

"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 is a pretty good smoke detector...." Read more

48 customers mention41 positive7 negative

Customers like the appearance of the gas smoke fire alarm. They mention it's nice, perfect, and clean looking after installation. Some say it'll be a great solution for their kitchen.

"Sleek design. Power indicator light. I like that it’s visible but not too bright. Comes with standard battery for power outages...." Read more

"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

42 customers mention42 positive0 negative

Customers find the replacement of the gas smoke fire alarm to be easy. They mention that the wiring harnesses are simple to swap out and install new mounting plates and plug them in. They also say that the detector is easy to replace and replaces hard wired detectors with ease.

"...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

147 customers mention66 positive81 negative

Customers are mixed about the false alarms. Some mention that they have not had any false alarm or problems of any kind, while others say that they started getting random false alarm.

"...I've had two since late 2017 and they terrorize me by going off in the middle of the night just randomly...." 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

"...Other than that, no complaints and after almost a year, not a single false alarm." Read more

83 customers mention50 positive33 negative

Customers are mixed about the battery life of the gas smoke fire alarm. Some mention that it uses AA backup batteries, which are much cheaper than the 9V, and easier to find spares when it does have low. However, others say that the batteries drained and were not good.

"...I like that it’s visible but not too bright. Comes with standard battery for power outages. Can link to other detectors if home is wired for that." Read more

"These First Alert Smoke alarms do NOT come with connectors...." 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

46 customers mention20 positive26 negative

Customers are mixed about the volume of the gas smoke fire alarm. Some mention that it's very easy to set-up, and loud, while others say that it is very shrill and starts sounding randomly.

"...Really loud! Even with my bedroom door closed I still jumped out of bed!" 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

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

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.
Hide
Thank you for your feedback
Sorry, there was an error
Sorry we couldn't load the review

Top reviews from the United States

Munchkinminder
5.0 out of 5 stars HAPPY THAT THE SAME ONE I PURCHASED 6 YEARS AGO WAS STILL AVAILABLE
Reviewed in the United States on April 4, 2024
Size: 1-PackStyle: HardwiredVerified Purchase
Of course my Smoke Alarm decides to go off in the middle of the night.
I had new Smoke Alarms installed 6 years ago.
Not sure what happened but even taking the battery out it still kept going off every hour or so.
I originally purchased them on Amazon 6 years ago and was very happy that they still had the same one available which means that I don't have to change out the plate.
I now know that if there ever is a fire overnight that this will DEFINITELY wake me up. Really loud! Even with my bedroom door closed I still jumped out of bed!
Helpful
 Report
Duane J
5.0 out of 5 stars Easy to install
Reviewed in the United States on April 14, 2024
Size: 1-PackStyle: HardwiredVerified Purchase
Sleek design. Power indicator light. I like that it’s visible but not too bright. Comes with standard battery for power outages. Can link to other detectors if home is wired for that.
Helpful
 Report
Paul Toth
5.0 out of 5 stars Worked as expected.
Reviewed in the United States on April 9, 2024
Size: 1-PackStyle: HardwiredVerified Purchase
SO easy. matched my other dectors and was even able to use the old base and wiring. Solved the issue of the alarm going off ramdomly and not be able to reset.
One person found this helpful
Helpful
 Report
Christine
4.0 out of 5 stars These do NOT come with connectors
Reviewed in the United States on April 29, 2024
Size: 1-PackStyle: HardwiredVerified Purchase
These First Alert Smoke alarms do NOT come with connectors. You will need to buy, separately, if you don't have already, connectors to connect to your houses hard wire system.
Helpful
 Report
Donnie
5.0 out of 5 stars Consumer Reports said this was the best one out there...
Reviewed in the United States on September 14, 2019
Size: 1-PackStyle: HardwiredVerified Purchase
...and that's why I purchased 5 of them.

I happened to notice the smoke detector in one of my bedrooms kinda of hanging as if it wasn't on the mount correctly and that got me thinking how old they were. They were all date stamped 1996 which is when the house was built. I know that previously I had replaced all the batteries when we bought the house in 2008 but I decided to replace all the units. Some research had turned up that 10 years seems to be the magic number for replacing smoke detectors.

I came on here and looked around at reviews and ratings and could not discern which one to purchase because all the reviews complained about how many false alarms they were getting. There was just no clear winner and I don't mind paying extra for a quality product, I just couldn't figure out which one was high quality.

So I purchased a subscription to Consumer Reports and for 2019 they said this was the best model out there (scored a 91, tied with the Kidde PI2010) of like 30 or more smoke detectors. Surprisingly the Nest scored a 55. Yikes I'm glad I didn't go that route.

Be careful with the battery tray when you close it. My first one was defective. The batteries it came with (Duracells with French writing on them) where chirping. I put in new Duracells and it was a struggle close the battery drawer. So much that it wound up breaking the electrical connector contact board. It twisted it at a 45 degree angle. I had to chat with an Amazon rep who promptly sent me a replacement. I didn't have to return the defective one so I disassembled it. That battery drawer is just too close to the contact board which is on tall pins that connect to the main board. You've been warned. The tolerance is tight on that. If you have to push hard it's best to do so by pushing down on the end of the drawer looking at the face of the detector so that you can read the writing on it.

So I threw out all the batteries they came with since I don't trust them. I purchased the Duracells with a 10 year lifespan. When I wired them I decided to not go with the interconnection between them.

I don't know what the deal is with all the reviews complaining about false alarms. Why do they always happen in the middle of the night to these people? Weird. I installed five of them very quickly and they all work just fine. No false alarms in a couple days. I like that they are hardwired and have a battery backup. I especially like the mounting ring. It's easy to lock into place without worrying that you're twisting the connectors cables around and around. It has 2 openings on the mounting track and you only have to turn them a quarter turn. The detectors it replaced didn't secure as easily or as well to the track and they were all FireEx brand detectors.

So far so good. I will definitely update this review should something go sideways. I also wrote the install date on the outside of the units so I can easily tell when they need to be replaced.
42 people found this helpful
Helpful
 Report
Thomas B Edmonds
5.0 out of 5 stars Perfect replacement for a 4 bedroom place
Reviewed in the United States on August 8, 2023
Size: 6-PackStyle: Dual Sensing Smoke AlarmVerified Purchase
Replaced some 20 years old Firex units. Unfortunately the plugs and mounting brackets need to be changed but it was an easy job.

This contractor pack saved money but no adapter cables included. Just bare lead connectors to replace my old ones to wire nuts which is really all you need.

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 pain to deal with. If you swap batteries do them one at a time and the battery disconnect pull tab won't fall out on you.

The hard part was figuring out which breaker they are powered by. I pulled the battery (maybe not necessary) from an old one near the breaker panel and left it dangling where I could eyeball it. Cycled breakers until I saw the LED go dark. In my case it turned out to be the upstairs bathrooms breaker which didn't bother anyone for the time I needed.

Always a good idea to dead check your 110vac at the wire nut before you start swapping out connectors. Also if you plan to use the interconnect orange wires you will want to at least start the strip on those wires before you climb the ladder.

Junction boxes are pretty standard so the original screws fit the new mounting bracket no problem. Wear some eye protection for the inevitable bits of paint or texture or drywall that will rain down upon you. Each will chirp once when you pull the battery tab so don't leave your ear too close.
6 people found this helpful
Helpful
 Report