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Features an electrochemical Carbon Monoxide sensing technology as well as an ionization sensor that detects the fine particles of a fast-burning fire Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85-decibel siren provides a clear, loud warning upon detection Simple to use, with a single test/silence button, and side-load battery compartment; tamper-resistant locking brackets and universal mounting brackets make installation easy Rigorously tested to meet UL standards
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| Manufacturer | - |
|---|---|
| Brand | First Alert |
| Item model number | SC9120B |
| Color | Gray |
| Weight | - |
| Height | - |
| Depth | - |
| Product Id | 885585 |
|---|---|
| User Reviews and Ratings | 4.6 (234 ratings) 4.6 out of 5 stars |
| UPC | 029054513069 |
| # | Title | Reviews | User Ratings | Price |
|---|---|---|---|---|
| 1 |
Search on Amazon
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| 2 |
9120BP Hardwired Smoke Alarm W/ Battery Back-up
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$25
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| 3 |
First Alert BRK Smoke + Carbon Monoxide Alarm AC Powered Cat. SC9120B OPEN BOX
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$29.99
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$29.99
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| 4 |
First Alert SC9120B Combination Carbon Monoxide & Smoke Alarm
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$29.99
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$29.99
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| 5 |
First Alert BRK SC9120B Smoke & Carbon Monoxide Detector
Price:
$29.99
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$29.99
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| 6 |
First Alert, BRK, SC9120B Hardwire Combo Smoke/Carbon Monoxide 2023 Production
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$33.97
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$33.97
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| 7 |
FIRST ALERT BRK SC9120FF Hardwired Smoke & CO Detector w/ Battery Backup
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$34.43
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$34.43
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| 8 |
First Alert SC9120B Combination Carbon Monoxide & Smoke Alarm
Price:
$34.99
on
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$34.99
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| 9 |
First Alert SC9120B Hardwired Smoke & Carbon Monoxide Detector with Battery...
Price:
$35.89
on
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$35.89
on
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| 10 |
First Alert SC9120B Combination Carbon Monoxide & Smoke Alarm AC Power Authentic
Price:
$37.99
on
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$37.99
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| 11 |
First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with
Price:
$39
on
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$39
on
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| 12 |
4 pk Smoke Detector and Carbon Monoxide Detector Co2 Detector Battery Powered
Price:
$39.9
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$39.9
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| 13 |
BRK First Alert Smoke & Carbon Monoxide Detector Model SC9120B w/Battery Back-up
Price:
$39.99
on
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$39.99
on
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| 14 |
FIRST ALERT BRK SC9120B Hardwired Smoke and Carbon Monoxide New Open Box… 11-107
Price:
$40
on
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$40
on
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| 15 |
BRK SC9120B Smoke & Carbon Monoxide Detector
Price:
$40
on
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$40
on
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| 16 |
First Alert SC9120B Smoke and Carbon Monoxide Smoke Alarm Detector
Price:
$40
on
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$40
on
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| 17 |
First Alert SC9120B Hardwired Smoke & Carbon Monoxide Detector with Battery...
Price:
$40
on
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$40
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| 18 |
First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with
Price:
$42.58
on
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$42.58
on
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| 19 |
First Alert SC9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with
Price:
$42.58
on
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$42.58
on
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| 20 |
BRK - Smoke and Carbon Monoxide Alarm - Wired in and battery powered
Price:
$44
on
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$44
on
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| 21 |
First Alert SC9120B Smoke & Carbon Monoxide Detector - Quantity - Free Shipping
Price:
$45
on
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$45
on
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| 22 |
First Alert SC9120B Combination Carbon Monoxide & Smoke Alarm AC Power Authentic
Price:
$45
on
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$45
on
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| 23 |
First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with
Price:
$49.33
on
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$49.33
on
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| 24 |
First Alert BRK SC9120B 85-Decibel Ionization Hardwired Smoke and Electrochemical Carbon Monoxide Detector with Battery Backup
Reviews: 234
Ratings:
(234)
Price:
$49.84
on
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234 | (4.6) |
$49.84
on
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| 25 |
BRK ALARM COMBO DC SLIM SMCO200 BOX 827C23
Price:
$56.26
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$56.26
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| 26 |
First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with
Price:
$56.29
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$56.29
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| 27 |
First Alert 10-Year Battery Hardwired Combination Smoke Carbon Monoxide Detector
Price:
$57.99
on
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$57.99
on
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| 28 |
First Alert SC9120B SMICO10 Combination Carbon Monoxide & Smoke Alarm AC Power
Price:
$58.95
on
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$58.95
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| 29 |
NEW First Alert SC9120B Combined Carbon Monoxide & Smoke Alarm AC Power, Battery
Price:
$58.99
on
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$58.99
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| 30 |
First Alert SC9120B/SMICO100-AC Combination Carbon Monoxide & Smoke Alarm AC
Price:
$59.26
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$59.26
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| 31 |
First Alert SC9120B/SMICO100 Combination Carbon Monoxide & Smoke Alarm AC Power
Price:
$59.26
on
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$59.26
on
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| 32 |
First Alert SC9120B Smoke and Carbon Monoxide Detector
Price:
$59.99
on
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$59.99
on
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| 33 |
BRK First Alert SC9120B - Hardwire Combination Smoke/Carbon Monoxide Alarm
Price:
$60.67
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$60.67
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| 34 |
AC/DC Smoke & Carbon Monoxide Detector
Price:
$61.95
on
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$61.95
on
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| 35 |
First Alert BRK SC9120B Hardwired Smoke and Carbon Monoxide CO Detector with
Price:
$62.46
on
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$62.46
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| 36 |
BRK Smoke/CO Alarm,2 in H,5.6 in W 825LZ1
Price:
$62.65
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$62.65
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| 37 |
BRK First Alert Carbon Monoxide,Smoke Alarm & 5-B:C rated fire extinguisher new
Price:
$63
on
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$63
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| 38 |
Super Hardwired Smoke Alarm And Carbon Monoxide Detector with Battery Backup 9V
Price:
$64.19
on
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$64.19
on
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| 39 |
First Alert SC9120B Combination Carbon Monoxide & Smoke Alarm AC Power Authentic
Price:
$64.99
on
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$64.99
on
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| 40 |
First Alert SC9120B 2-Hardwired Smoke & Carbon Monoxide Detector with Battery...
Price:
$65
on
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$65
on
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| 41 |
BRK ELECTRONICS SC9120B First Alert Hardwire Combination Smoke/Carbon Monoxide A
Price:
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$67.73
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| 42 |
First Alert BRK Smoke and Carbon Monoxide Detector - Hardwired SC912 (PKY004194)
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| 43 |
First Alert BRK Smoke and Carbon Monoxide Detector - Hardwired SC912 (PKY004193)
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$69.99
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| 44 |
First Alert SC9120B Hard Wired Dual Smoke & Carbon Monoxide Alarm with Backup
Price:
$75
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$75
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| 45 |
First Alert SC9120B Smoke and Carbon Monoxide Detector 2 pack alarms
Price:
$79.99
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$79.99
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| 46 |
First Alert BRK 9120B-6 Hardwired Smoke Detector
Price:
$90
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$90
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| 47 |
QTY 3 First Alert Hardwired Smoke & Carbon Monoxide Detector SC9120B
Price:
$92.99
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$92.99
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| 48 |
First Alert BRK SC9120B (2 pack) Smoke & Carbon Monoxide Detector w/ Batt Backup
Price:
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$93.95
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| 49 |
First Alert SC9120B 3-Hardwired Smoke & Carbon Monoxide Detector with Battery...
Price:
$119.99
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$119.99
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| 50 |
First Alert BRK 9120B-6 Hardwired Smoke Detector
Price:
$120
on
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$120
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| 51 |
New Model SMICO105-AC Smoke & Carbon Monoxide Alarm First Alert SC9120B 2024
Price:
$134.99
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$134.99
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| 52 |
First Alert SC9120B SMICO100- Combination Carbon Monoxide & Smoke Alarm 3 pack
Price:
$158.26
on
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$158.26
on
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| 53 |
First Alert BRK SC9120B-3/SMICO100-AC Smoke & Carbon Monoxide CO Detector 3 pack
Price:
$162.26
on
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$162.26
on
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| 54 |
First Alert SMICO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm
Price:
$189
on
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$189
on
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| 55 |
First Alert BRK SC9120B-6 /SMICO100- Smoke & Carbon Monoxide CO Detector 6 pack
Price:
$326.26
on
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$326.26
on
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| 56 |
First Alert SC9120B Carbon Monoxide & Smoke Alarm AC Power & Battery (6 Pack)
Price:
$329.99
on
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$329.99
on
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| 57 |
First Alert BRK SC9120B-12 Hardwired Smoke and Carbon Monoxide (CO) Detector ...
Price:
$604.99
on
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$604.99
on
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| 58 |
BRK First Alert SC9120B/SMICO100-AC Carbon Monoxide Smoke Alarm AC Power 12 pack
Price:
$626.26
on
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$626.26
on
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| 59 |
First Alert BRK SC9120B-12/SMICO100 Hardwired Smoke & Carbon Monoxide CO 12pack
Price:
$626.26
on
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$626.26
on
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| 60 |
First Alert BRK SC9120B-12 Hardwired Smoke and Carbon Monoxide (CO) Detector ...
Price:
$647.99
on
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$647.99
on
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The smoke detector is the original one that is wired with battery back up installed in my home. I needed a replacement and Walmart had the best prices for this unit
I received the exact product I wanted; a replacement for what I had when my home was built 12 years ago. These alarms have a shelf life, so it is important that it is recently manufactured; and it was...November 2016. Very happy with the price, the quick shipment, product, and how current the device is.
we had to replace the alarms that were the original alarms when we built the house 10 years ago.these were the same brand,but not the exact same model number. we were able to just replace the main part without rewiring etc.
My purchase arrived on time. It was exactly like the one that I had originally so the installation was a snap. It was even $20 cheaper than at big box store. Loved the savings!!!!
This was to replace my original one that died after 10 years. Walmart was quick to deliver it. The instructions are included and very clear. If you're replacing the same model it connects effortlessly. There are also wires to connect if needed. It was much cheaper than a Walmart competitor.
Loved the fact that we already had the old alarm up so all i had to do was take the old alarm down and plug this one in and its ready you dont have to do any installing because its the same model no. and can use the old mounting bracket!! Bought our new home and it came with this alarm and when i looked at the back of the old alarm it was from 2006 so it made it 13 years 3 years over the ten year warranty which is a good buy!! Waiting on the other ones to go which are probably the same year so probably buy in bulk knowing they work and last!!
Buy a battery! This item does come with a battery but it is a dead battery. The detector will not work until you replace the battery supplied by the vendor. First Alert/BRK you should do better than this.
Fit the old installation without rewiring. Yay! on the other hand I am replacing a unit from a new build 4 years ago and there are still about 7 to go
I replaced every smoke alarm in my house in 2018 with the First Alert SC9120B unit. This one failed this year. Six years is not a bad run, but it is well short of expected lifespan. I am now concerned about the other 8 in my house
My package was open. I am going to assume someone else used it and return it. Not satisfied