First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup for sale


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Amazon.com Product Description

The BRK hardwire combination smoke and carbon monoxide alarm detects two hazards with one simple unit. Carbon monoxide (CO) is a colorless, odorless, deadly gas. It can be emitted by sources including gas or oil furnaces, gas clothes dryers, water heaters, fireplaces, wood stoves, charcoal grills, gas ranges, and space heaters. A clogged chimney, improper venting, and attached garages can also cause carbon monoxide accumulation. According to the Consumer Product Safety Commission (CPSC), at least one CO alarm should be installed near a home's sleeping area.

The BRK SC9120 hardwire combination smoke and CO alarm with battery backup includes these features:

  • Quick plug-in power connector for easy installation.
  • 120-volt AC inter-connectable (with maximum 18 compatible devices). The alarm can be interconnected with up to 12 other compatible smoke alarms and six compatible devices like bells, horns, repeaters and door closers. If one unit triggers an alarm, all smoke alarms in the series will sound. Power indicators show which unit in the series initiated the alarm.
  • Ionization sensor which is more effective at detecting flaming fires which consume combustible materials rapidly and spread quickly.
  • Microprocessor controlled for fewer nuisance alarms.
  • Single test/silence button which both silences a non-threatening alarm or low battery warning and allows you to test the unit's functionality.
  • Automatically performs internal test of functionality.
  • Latching alarm indicator which automatically identifies which unit initiated the alarm.
  • Separate smoke and carbon monoxide visual and audible warnings.
  • Battery drawer lock and mounting bracket lock for tamper resistance.
  • AC power indicator and alarm indicator light.
  • Low battery warning "chirp" and missing battery tab.
  • 9-volt battery backup for peace of mind during power outages.
All BRK Electronics carbon monoxide alarms are listed to UL Safety Standard 2034 for residential carbon monoxide alarms. Includes 9-volt backup battery. 5-year limited warranty.--Bree Norlander

What's in the Box
One combination smoke and CO alarm, one 9-volt battery, and user's manual


  • Superior carbon monoxide sensor and dual ionization smoke alarm
  • Inter-connectable with BRK and First Alert hardwired smoke and carbon monoxide alarms
  • Easy to install universal mount bracket
  • Simple to use silence/test button; separate smoke and CO latching alarm indicators
  • 9-volt battery included; 5-year limited warranty


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First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup Reviews


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Customer Reviews
Average Customer Review
85 Reviews
5 star:
 (48)
4 star:
 (16)
3 star:
 (3)
2 star:
 (2)
1 star:
 (16)
 
 
 

54 of 57 people found the following review helpful:
4.0 out of 5 stars Definitely an upgrade -- and a simple swap, too!, July 16, 2008
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This review is from: First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup (Tools & Home Improvement)
Our house was wired for smoke detectors -- specifically the rather cheesy BRK 4120SB, which delights in false "low power" chirping. My goal was to replace the ones in the bedrooms with combination alarms that would alert us not only to smoke but to the presence of carbon monoxide. (Not to scare you but harm and even death from carbon monoxide poisoning are definite risks, especially in a home with deep-sleeping teenagers.)

I needed units that would be compatible with the wiring of our current system, and ideally ones that would accept the power leads, as wired. After some research here and elsewhere, I called the BRK help line and got definite information about the unit that would be compatible, as well as locations within the home where I both should and should not install units.

I ordered two units to start with, still being a bit leery of my previous experience, and can say that installation took less than 5 minutes per device.

1. Follow the... Read more
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24 of 27 people found the following review helpful:
1.0 out of 5 stars Stay clear of this headache, February 7, 2009
This review is from: First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup (Tools & Home Improvement)
Received three BRK SC9120B replacements after original units (4 years old) started a low battery chirp with new Duracell batteries. Spoke with BRK rep. about problem and they sent three new units with Duracell batteries. The units worked fine for about two weeks before all three started to chirp a low battery signal. In that time our other three BRK smoke only detectors that were installed 4 years ago started the same chirping sound. Again called BRK and they were going to send us three replacements for them. After the nightmare of having six four year old BRK products fail in a matter of three weeks and three brand new replacement units fail in two weeks. I would stay away from BRK! I have read elsewhere about an issue with BRK and Duracell so I was a bit surprised when the new units arrived with Duracell batteries in them.
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36 of 43 people found the following review helpful:
1.0 out of 5 stars No Zero Stars Option - Alarm Resulted in Massive Property Damage, December 21, 2010
By 
Juana "Juanita Beasley" (Baltimore, MD United States) - See all my reviews
This review is from: First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup (Tools & Home Improvement)
I have a rental property and this year, the city's new regulation required installation of these detectors. One of the detectors malfunctioned and the terrified tenant called 911, who proceeded to do over 1000 dollars in property damage.

I subsequently found out that even the EPA has admitted that many of the CO detectors they tested were unreliable, and either went off at too low of a level or did not sound at dangerously high levels.

According to their website, the best way to keep the building's inhabitants safe is to have fuel-burning appliances properly installed and maintained by licensed professionals to make sure that the gases (including CO) are vented properly.

I ended up doing a lot of research related to CO as a result. I have the documentation from the Fire Department indicating the levels that they measured (WAY BELOW the low threshold on the detector) even near the detector.

I knew that a problem was unlikely since the heat... Read more
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