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Smoke Alarm - Dual Ionization Sensor - Detects Flaming Fires - 120V Wire-in with Battery Backup - Interconnectable - BRK 9120B
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BRK 9120B - Smoke Detector

Dual Ionization Sensor - Detects Flaming Fires - 120V Wire-in with Battery Backup - Interconnectable

The BRK 9120B dual ionization smoke detector features a dual ionization sensing chamber, which enables it to detect the small particles produced by fast, flaming fires. A single button both silences false alarms and allows the user to test the alarm with ease. The smoke detector also has two power sources: 120 volt for hard wiring and a 9 volt battery backup for peace of mind during power outages. Listed to UL 217 standards, the alarm operates at temperatures from 40 to 100 degrees Fahrenheit and in humidity up to 90% and has an 85-decibel alarm.


Stock Code:  BRK-9120B
Part No.:  9120B
Voltage:  120
Battery Type:  9 Volt Alkaline (Included)
Diameter:  5.6 in.
Sensor Type:  Ionization Sensor for Fast Flaming Fires
UL Listed:  UL 217
Case Quantity:  12
Brand:  BRK
UPC:  029054513014
Battery Backup:  Yes
Depth:  2 in.
Finish:  White
Weight:  0.61 lb.
Warranty:  10 Years

Customer Reviews

Rated 4.9 out of 5 by 15 reviewers.
Rated 5 out of 5 by Appearance is great. Great features Easy installation. Just change the base. Wiring connected to existing house wiring. Can be used with household wiring or individually with battery backup. April 14, 2014
Rated 5 out of 5 by Easy retrofit Purchased this unit to replace a 10 year old unit that has been discontinued. The information on the site was accurate so all that I needed to do was mount the new ceiling bracket and connect to the existing wiring. The whole process took 15 minutes. Thanks!! January 31, 2014
Rated 5 out of 5 by Great Product, Excellent Price I purchased about 10 couple years ago and they all still working. Purchased about 10 more in Dec to replace very old units. The wire and battery option is required for me so it fits perfectly in the hotel rooms. January 17, 2014
Rated 4 out of 5 by Great dual purpose smoke detector I bought these to replace 12 year old units. I bought both the hard wired with battery back up and battery powered only units. I much preferred these dual powered for installation and maintainability. I would have used them in all locations had I known the quality of these units at the time of purchase. August 30, 2013
Rated 5 out of 5 by Great replacment detector at a great price! This detector was a direct replacement for my old unit and was easy to install as advertised. No more false alarms in the middle of the night! Updated styling looks great too! March 14, 2013
Rated 5 out of 5 by Very Nice this product met all the features i have been searching for in a smoke detector great ez installation as well May 12, 2012
Rated 5 out of 5 by Excellent product at any price! I bought these to replace old Firex detectors that I installed during construction in 2002. Your detectors need to be replaced at least every 10 years. These are a great choice. March 11, 2012
Rated 5 out of 5 by EXCELLENT VALUE, EASY TO INSTALL I purchased three of these to replace the old BRK 4120B detectors in my upstairs hallway and sleeping rooms. If you are doing the same, you will have to take down the old mounting bracket, as the 9120B will not fit, however it's as easy as loosening two screws and rotating the old bracket out, and putting the new one on. The wiring harness is the same, so they are literally plug-and-play. I haven't been able to find these locally at the low price that 1000bulbs sells them for, so I will purchase another three soon, thus completing my home's smoke alarm updates. February 8, 2012
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