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Home / Home & kitchen / Fire Safety / First Alert SMCO100
6.9 Tested Aug 31, 2026 by Team RankingRight

First Alert SMCO100 (2-in-1, battery) review 2026

Battery-operated smoke + CO combo with First Alert's "Precision Detection" sensing and a 10-year warranty

PriceFrom $55.99 · checked Sep 21, 2026

Is the First Alert SMCO100 Worth It?

Straightforward battery combo alarm. A conventional AA-powered combo alarm from an established brand. The tradeoff against the sealed-battery X-Sense and Kidde units here is exactly the one you'd expect: cheaper batteries to source, but one more thing to remember to replace.

First Alert SMCO100 Pros & Cons

Pros
  • Photoelectric smoke sensing plus CO detection in one unit
  • User-replaceable AA batteries rather than a sealed cell
  • 10-year limited product warranty
Cons
  • User must remember to change AA batteries, unlike sealed-battery rivals
  • No specific UL 217/2034 certification number published on the listing we checked
  • No independent outlet score found for this exact model

First Alert SMCO100 at a Glance

6.9 Editor Score
Certification & ratingUL/CDC fire-class rating for extinguishers, or UL 217/2034 certification for smoke & CO alarms.
22/30
Independent review consensusHow this model is rated by outlets that hands-on test fire-safety gear (Consumer Reports, Bob Vila, This Old House).
16/25
Ease of useMounting/install, activation or hush controls, app or voice alerts where applicable.
14/20
Battery & backupBattery type and sealed life, or rechargeable service interval; hardwire/AC backup where applicable.
10/15
ValuePrice against the coverage and warranty you get.
7/10
Reader ratingNo reader ratings yet — not part of the score
–

Rubric v1: Certification & rating 30 · Independent review consensus 25 · Ease of use 20 · Battery & backup 15 · Value 10. Score = Σ ÷ 10, locked Sep 21, 2026. How we rank.

Where to buy — prices checked Sep 21, 2026

Target — $55.99

Best priceSee Price

First Alert SMCO100 specifications

TypeSmoke & CO alarm
Battery2x AA (included)
Warranty10 yr

Why it scored 6.9

A conventional AA-powered combo alarm from an established brand. The tradeoff against the sealed-battery X-Sense and Kidde units here is exactly the one you'd expect: cheaper batteries to source, but one more thing to remember to replace.

Where it loses

No independent review score found; user-replaceable batteries.

Still the right pick for

Budget-conscious buyers who don't mind swapping AAs.

What owners say

No reader ratings yet. This block fills in from real submissions only — we never write, buy or generate reader reviews, and none of them touch the editor score.

Changelog: Sep 21 — rank 7 → 8; Sep 21 — rank 8 → 9; Sep 21 — rank 6 → 7 · all changes

First Alert SMCO1006.9 · $55.99
See Price