First Alert BRK Smoke Alarm, Interconnect Hardwire Detector with 10-Year Battery Backup, SMI105-AC, 3-Pack
First Alert

First Alert BRK Smoke Alarm, Interconnect Hardwire Detector with 10-Year Battery Backup, SMI105-AC, 3-Pack

$98.94$109.99★ 4.5(878 reviews)
Mubboo Score 3.9/10
  • First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and pro…
  • 10-Year battery backup provides continuous protection during power outages
  • Through early warning interconnect, when one alarm sounds, all compatible* alarms will sound
  • Alarm indicator visually identifies the unit that initiated the alarm
  • End-of-life warning lets you know when it’s time to replace the alarm
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Mubboo Value Score: 3.9/10

Quality9.0/10
based on 4.5/5 customer rating
Popularity0.5/10
878 reviews, top 38% in Smoke Detectors
Value2.2/10
priced below 22% of Smoke Detectors

How it stacks up

Rated 4.5/5 — better than 51% of 37 Smoke Detectors we track. Premium-tier pricing at $98.94.

Head-to-Head vs Category Leader

First AlertKidde (Leader)
Price$98.94$49.97
Rating4.5/54.9/5
Reviews87818
Mubboo Score3.9/105.3/10

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

Quick Specs

Alarm
Audible
Color
White
Style
Precision Detection
Unit Count
3.0 Count
Item Weight
0.7 Pounds
Sensor Type
Ionization
Manufacturer
Resideo
Model Number
SMI105-AC

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 First Alert

  • 100 products in our database
  • Average rating: 4.6/5 across all products
  • Price range: $13.98 – $648
  • Categories: Carbon Monoxide Detectors, Fire Extinguishers, Smoke Detectors

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First Alert SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup 2 Pack
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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
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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 First Alert First Alert BRK Smoke Alarm, Interconnect Hardwire Detecto worth buying in 2026?

It earns a Mubboo Score of 3.9/10, with a 4.5/5 rating from 878 reviews — better than 51% of Smoke Detectors we track.

How much does the First Alert First Alert BRK Smoke Alarm, Interconnec cost?

It is currently $98.94 — premium-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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