First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 3-Pack
First Alert · 3 more picks →
Best for
Best combined smoke + CO multipack
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Current price
$96.87
Updated Jun 27, 2026 · 1 min read
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Across verified-purchase reviewers, this First Alert combination smoke-and-CO alarm earns a 4.6 average over more than 850 ratings, the highest-rated multipack in our pool. Buyers value the three-pack value, the test-and-silence button, and the convenience of covering smoke and carbon monoxide in a single battery-operated unit. As with the rest of this thin category, we found no independent expert lab testing, specialist-community threads, or video reviews in the supplied signals, so the verdict rests on customer ratings alone.
What reviewers liked
- Best-rated multipack in the pool: 4.6 across 867 verified reviews
- Three-pack covers multiple rooms in a single, cost-effective purchase
- Test-and-silence button noted as convenient by buyers
Where it falls short
- Combination sensor means the whole unit is retired when either sensor expires
- No independent expert or specialist-community testing available to confirm performance
- Battery-operated design requires routine battery maintenance
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Across verified-purchase reviewers, this First Alert combination smoke-and-CO alarm earns a 4.6 average over more than 850 ratings, the highest-rated multipack in our pool. Buyers value the three-pack value, the test-and-silence button, and the convenience of covering smoke and carbon monoxide in a single battery-operated unit.
As with the rest of this thin category, we found no independent expert lab testing, specialist-community threads, or video reviews in the supplied signals, so the verdict rests on customer ratings alone. Combination units do carry the inherent trade-off that the whole detector must be replaced when either sensor reaches end of life, a point worth weighing against CO-only alternatives. For households that want straightforward multi-room coverage in one purchase, the customer consensus is solidly favorable.
- First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency
- Provides reliable 2-in-1 protection against both smoke and carbon monoxide
- End-of-life warning lets you know when it’s time to replace the alarm
- Battery-operated alarm allows for easy installation and maintenance
- Test/silence button for efficient testing to ensure alarm is working properly
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