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First Alert 3120B Hardwire Photoelectric and Ionization Smoke Alarm with Battery Backup

4.4 out of 5 stars 147 customer reviews
| 40 answered questions

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Include installation | Estimate $71.95 | ZIP
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  • Service provided by a local pro
  • Safety inspection of new detector
  • Mounting/wiring 1 detector in current location
  • Completing unit test cycle
  • Demonstrating proper usage and maintenance
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Estimate: $71.95
88% positive ratings (8 reviews)
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  • Dual Photoelectric and Ionization sensing technologies for optimal sensing of smoke particles produced in both flaming and smoldering fires.
  • Two Latching Features
  • Two Silence Features
  • Optipath 360 Technology
  • 2 AA Batteries Included; 10 Year Limited Warranty
26 new from $25.00

Frequently Bought Together

  • First Alert 3120B Hardwire Photoelectric and Ionization Smoke Alarm with Battery Backup
  • +
  • BRK Brands SC7010B Hardwire Photoelectric Smoke and Carbon Monoxide Alarm with Battery Backup
Total price: $71.65
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Product Description

Product Description

The BRK 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 multi-family 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.

From the Manufacturer

The BRK 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 multi-family 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.

Product Information

Technical Details

Part Number 3120B
Item Weight 11.7 ounces
Product Dimensions 5 x 5 x 2 inches
Item model number 3120B
Batteries 2 AA batteries required. (included)
Power Source battery-powered
Item Package Quantity 1
Sound Level 85 dB
Batteries Included? Yes
Batteries Required? Yes
Average Battery Life 4320 hours
Warranty Description 10 Year Limited Warranty

Additional Information

ASIN B0064S9KLC
Customer Reviews
4.4 out of 5 stars 147 customer reviews

4.4 out of 5 stars
Best Sellers Rank #44,108 in Home Improvements (See top 100)
#127 in Home Improvement > Safety & Security > Fire Safety > Smoke Detectors & Fire Alarms
#308 in Home Improvement > Safety & Security > Household Sensors & Alarms
#3,173 in Home Improvement > Contractor Supply
Shipping Weight 12 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available June 10, 2011

Warranty & Support

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From the Manufacturer


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
We needed to replace a total of nine smoke detectors in two houses and after some research, these look to be a good, dual sensor replacement. I already knew that one house had a different brand and I would need to replace the three wire connection plug with the new one included in the box. The other house had BRK/First Alert and was much easier. Those alarms were 12 years old and only had to replace the mounting base as the connection plug was the same.

I decided to go ahead and get the 10-year lithium batteries as may not need to replace them until the smoke alarms need replacing again in 8-10 years. Since the alarms will chirp if the battery gets low and with testing them every so often, they should last as we don't have many power failures. I will just use the included Duracell's in flashlights or other electronics as always needing them.

Before you take off the old ceiling mounting bracket, hold the new one up to it & see if it's smaller or bigger. In our case, it was a little bigger then the house that had the BRK/First alert, and a little smaller than the older house with the other brand. Then you will know if you need to paint around it once installed. If the old bracket is stuck to the wall/ceiling with paint, take a razor blade and cut around the edge before taking it down to keep from pulling off a strip of paint.

There has been several questions about these smoke alarms and to help out others, I have upload several pictures to see. I believe seeing real pictures are always better. I installed all nine of these and worked perfectly, also triggering them all when once goes off since they were wired up as interconnected.
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Verified Purchase
- Dual smoke detectors (ionization and photoelectric) ensure that you get the advantages and safety of both, even the experts disagree on which is better (but they generally lean towards photoelectric) and Consumer Reports highly recommends dual detectors
- AA batteries are convenient and store more energy, and extremely long-lasting ones (i.e. Energizer Ultimate Lithium) are now available at a relatively reasonable cost, perfect for this application
- Alarm has a relatively small diameter and profile
- Test button doubles as a "Hush" function during accidental alarms
- Can be teamed with a single, highly-rated BRK/First Alert SC7010BV to add carbon monoxide detection to your residential alarm system
- Ionization smoke detectors need to be replaced after 10 years, they wear out
- Don't mix and match smoke and CO detector brands in your system, each uses a different interconnection scheme
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Verified Purchase
We saw a TV news story, demonstrating that ionization smoke detectors are not good at detecting smoky fires, and photoelectric detectors not so good at hot, non-smoky ones. We wanted to get dual detectors to replace the existing ionization detectors in our condo. The existing units were made by BRK, so I ordered one of these dual ones and verified that it was in fact plug-compatible with the networked wired units. Then I ordered 5 more. The 6 units needed only new mounting rings on the ceiling, and plugged into the existing wiring. Replacing all 6 took less than an hour's work, and now we are better protected.
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Update 5/1/2016: This smoke alarm is going on 3 years old now, no false alarms.
+++++++++++++++++++++++
This has both photoelectric and ionization sensing in one unit, whereas before I needed 2 separate smoke alarms in the hallway. The mounting plate has a different hooking pattern than my alarm from 10 years ago, the 7010B, so I removed the old mounting plate and replaced it with this. However, the wiring connector is the same so the hook-up was easy. This uses two AA batteries, whereas most others I've seen use a 9V battery.

You could purchase a couple lithium AA batteries and never have to worry about replacing them for 10 years, which is the lifespan of this smoke alarm. Energizer AA Lithium Batteries 2 Pack, Lasts 9 Times Longer. One feature I like (if you don't buy the lithiums) is if you have a low battery and it starts chirping, you can press the button to silence it for 8 hours to give you time to go out and get batteries without the chirping sound making you crazy.

Even though I have this in a hallway very close to my master bath, the excess humidity doesn't seem to bother it.
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Verified Purchase
Had existing BRK 4120 smoke alarms that were installed by builder 13 years ago and starting to experience ghost alarms in the middle of the night terrifying the kids. The direct replacement BRK 9120 had a lot of 1 out of 5's so went with the 3120's instead. I wanted the Photoelectric and Ionization combo anyway. These were super easy to install as they continue to use the same wiring harness. Just unplug old, remove and install new backing plate and plug in new. These new backing plates allow you to easily level the alarms so they aren't all crooked, so they look more professional installed. Only negative is the new backing plate is smaller than the 4120's in diameter, so had to repaint as previous owner just painted around the old ones. Will follow up if any false alarms.
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Verified Purchase
Sensitive but not too sensitive; already used the silence feature when dinner got burnt. Overall well worth the extra cost versus the crap ones that were installed by the builder. The latch feature, which leaves a light on the detector that set off the alarm, is the reason I bought 6 of these for home.
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