 - 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
List Price: $68.99
Lowest Price: $34.95 
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 NorlanderWhat's in the Box
One combination smoke and CO alarm, one 9-volt battery, and user's manual
Customer Reviews: Rating: 
Date: 2008-06-30
poor design - don't buy this product
The BRK combination smoke and carbon monoxide alarm requires BOTH 110VAC AND 9VDC (Energizer type battery please) for proper operation.
You can use this alarm without the 110VAC if you like, but be prepared to replace the 9 volt battery every 3 weeks. If you use the device on 110VAC only, it will emit random false "low battery level" notices - loud beeps (in the middle of the night !). BRK (the manufacturer) denied the device had any issues at all and suggested I "properly follow the instructions" (which I enjoyed reading in the Spanish version included with my superior BRK alarm system). The product description (on Amazon) says: "9-volt battery backup for peace of mind during power outages". Right.
If you are into home improvement projects, then go ahead, make this purchase. You will have a chance to make your own 110VAC cable connection - no cable is supplied. You will also be challenged to find a way to fit this cable mess into the back of the device housing - there is no space there.
If, however, you intend to purchase a smoke alarm FOR peace of mind, try another product - and another brand.
Rating:
Date: 2008-06-06
Falsy Advertised as "Easy to Install"
First of all, this does not come with a power connector you can plug into your wall. Second, it requires you connect it to a junction box which was not mentioned in the ad. I do not have a junction box and it's necessary for AC power which means I would have to buy one and figure out how to install that as well. I am not familiar with any of the "easy to install" installation instructions and am glad I can just use the battery backup as the main power source. Do not buy this if you don't know how to connect wires to junction boxes and it also requires a wire stripper which you would also have to buy. For this price and all the wonderful reviews I at least expected to be able to install it without buying more stuff and getting my Electrician father-in-law to help. Rating: 
Date: 2008-03-03
Good product - minor backward compatibility issue with mount
I bought this product to replace a defective older BRK Smoke/CO alarm unit (can't remember the model #, maybe SC6120?) about a month ago. This model is the official replacement for my older unit. I was hoping to just be able to plug this into the existing BRK mount but it didn't fit. I had to remove the old mount and install the new mount plate that came with the product. Not a big deal but a little extra work. So far I haven't encountered any problems with the new unit. Rating: 
Date: 2007-09-08
replacement for old unit
Was going to purchase another combo unit, until I read that the shipping was 3-5 weeks - no thanks. I'm very happy with this one. Setup was a breeze, it attached easily, and works perfectly - even came loaded with backup battery. Now I REALLY feel safe. Rating:
Date: 2006-04-06
Easy install, easy to test, easy to replace batteries
It was a breeze to install. Tested the unit and it has a piecing audible alert. Battery can be easily replaced w/o removing the unit. | 
