First Alert SMICO105-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup, 3-Pack
First Alert

First Alert SMICO105-AC, Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with 10-Year Battery Backup, 3-Pack

$157.95$229.99★ 4.6(290 reviews)
Mubboo Score 3.6/10
  • First Alerts Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and prov…
  • 10-Year battery backup provides continuous protection during power outages
  • Through early warning interconnect, when one alarm sounds, all compatible
  • Quick Connect Plug allows for easy installation with no need to rewire
  • Alarm indicator visually identifies the unit that initiated the alarm
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Mubboo Value Score: 3.6/10

Quality9.2/10
based on 4.6/5 customer rating
Popularity0.2/10
290 reviews, top 73% in Smoke Detectors
Value1.4/10
priced below 14% of Smoke Detectors

How it stacks up

Rated 4.6/5 — better than 78% of 37 Smoke Detectors we track. Premium-tier pricing at $157.95.

Head-to-Head vs Category Leader

First AlertKidde (Leader)
Price$157.95$49.97
Rating4.6/54.9/5
Reviews29018
Mubboo Score3.6/105.3/10

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

Quick Specs

Color
White
Style
Smoke, CO
Item Weight
10.56 ounces
Sensor Type
Ionization
Manufacturer
Resideo
Model Number
SMICO105-AC
Power Source
Corded Electric
Product Style
Smoke, CO

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
🟢 Sold & shipped by Amazon

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
$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 First Alert First Alert SMICO105-AC, Interconnect Hardwire Combination worth buying in 2026?

It earns a Mubboo Score of 3.6/10, with a 4.6/5 rating from 290 reviews — better than 78% of Smoke Detectors we track.

How much does the First Alert First Alert SMICO105-AC, Interconnect Ha cost?

It is currently $157.95 — 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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