BRK SC9120B Smoke and Carbon Monoxide Alarm
BRK

BRK SC9120B Smoke and Carbon Monoxide Alarm

$52.44★ 4.7(270 reviews)
Mubboo Score 5.1/10
  • Superior carbon monoxide sensor and dual ionization smoke alarm
  • Simple to use silence/test button; separate smoke and CO latching alarm indicators
  • 9-volt battery included; 7-year limited warranty
  • Inter-connectable with BRK and First Alert hardwired smoke and carbon monoxide alarms
  • Easy to install universal mount bracket
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Mubboo Value Score: 5.1/10

Quality9.4/10
based on 4.7/5 customer rating
Popularity0.1/10
270 reviews, top 76% in Smoke Detectors
Value5.7/10
priced below 57% of Smoke Detectors

How it stacks up

Rated 4.7/5 — better than 95% of 37 Smoke Detectors we track. Mid-tier pricing at $52.44.

Head-to-Head vs Category Leader

BRKKidde (Leader)
Price$52.44$49.97
Rating4.7/54.9/5
Reviews27018
Mubboo Score5.1/105.3/10

The category leader Kidde Smoke Detector, AA Battery-Powered, Wire offers better ratings at $49.97.

Quick Specs

Item Weight
10 ounces
Part Number
SC9120B
Manufacturer
BRK
Power Source
battery-powered
Customer Reviews
4.6 out of 5 stars
Battery Cell Type
Alkaline
Item model number
SC9120B
Package Dimensions
5.79 x 5.75 x 2.4 inches

What reviewers say

Synthesized from 40 reviews · 100% verified purchases.

Test units upon arrival, as included batteries may be dead or drain quickly. Verify activation tab functions and note that sealed-battery models may not interconnect with other alarms.

Rating reliability

Moderately reviewed — reasonably reliable

About BRK

  • 13 products in our database
  • Average rating: 4.8/5 across all products
  • Price range: $18.99 – $233.98
  • Categories: Carbon Monoxide Detectors, Smoke Detectors

Other Smoke Detectors

First Alert SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup 2 Pack
First Alert SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup 2 Pack
$107.50 ★4.8
BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
$18.99 ★4.7
Hilmon Smoke Alarm Fire Detector,Battery Operated Photoelectric Smoke Detector with Test Button and Low Battery Warning, Fire Alarms Smoke Detectors for Home, 6 Pack
Hilmon Smoke Alarm Fire Detector,Battery Operated Photoelectric Smoke Detector with Test Button and Low Battery Warning, Fire Alarms Smoke Detectors for Home, 6 Pack
$56.99 ★4.7
First Alert 9120B 120 Volt Hardwired Smoke Alarm With Battery Back Up 5 Pack
First Alert 9120B 120 Volt Hardwired Smoke Alarm With Battery Back Up 5 Pack
$83.26 ★4.7

Frequently Asked Questions

Is the BRK BRK SC9120B Smoke and Carbon Monoxide Alarm worth buying in 2026?

It earns a Mubboo Score of 5.1/10, with a 4.7/5 rating from 270 reviews — better than 95% of Smoke Detectors we track.

How much does the BRK BRK SC9120B Smoke and Carbon Monoxide Al cost?

It is currently $52.44 — mid-tier pricing for Smoke Detectors.

How does it compare to the top-rated Smoke Detectors?

The category leader Kidde Smoke Detector, AA Battery-Powered, Wire offers better ratings at $49.97.

Sources & References

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