First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 6-Pack
First Alert

First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 6-Pack

$93.26$139.99★ 4.7(96 reviews)
Mubboo Score 4.0/10
  • First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and pro…
  • Through early warning interconnect, when one alarm sounds, all compatible alarms will sound
  • Battery backup provides continuous protection during power outages
  • Alarm indicator visually identifies the unit that initiated the alarm
  • Quick Connect Plug included allows for easy installation with no need to rewire
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Mubboo Value Score: 4.0/10

Quality9.4/10
based on 4.7/5 customer rating
Popularity0.0/10
96 reviews, top 81% in Smoke Detectors
Value2.4/10
priced below 24% of Smoke Detectors

How it stacks up

Rated 4.7/5 — better than 95% of 37 Smoke Detectors we track. Premium-tier pricing at $93.26.

Head-to-Head vs Category Leader

First AlertKidde (Leader)
Price$93.26$49.97
Rating4.7/54.9/5
Reviews9618
Mubboo Score4.0/105.3/10

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

Quick Specs

Alarm
Audible
Color
White
Style
hardwired smoke alarm
Unit Count
6.0 Count
Item Weight
0.6 Pounds
Sensor Type
Ionization
Manufacturer
Resideo
Model Number
SMI100-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

Limited reviews — rating may shift with more data

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
$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 First Alert First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm w worth buying in 2026?

It earns a Mubboo Score of 4.0/10, with a 4.7/5 rating from 96 reviews — better than 95% of Smoke Detectors we track.

How much does the First Alert First Alert SMI100-AC, Hardwire Intercon cost?

It is currently $93.26 — 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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