First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup and Voice & Location Alerts, SMCO100V-AC, 3-Pack $148

ginuwinqbin

Apr 15, 2026 3:19 PM

1.1K Comments

Joined Mar 2009

ginuwinqbinApr 15, 2026 3:19 PM

1.1K Comments

Normal price $60/each so saving $10/each.

big_remo

Apr 21, 2026 6:44 PM

240 Comments

Joined Dec 2007

big_remoApr 21, 2026 6:44 PM

240 Comments

You can buy two 2-packs here at Costco for about the same price: https://www.costco.com/p/-/first-...?langId=-1

PostConsumerWat

May 24, 2026 1:07 PM

268 Comments

Joined Oct 2012

PostConsumerWatMay 24, 2026 1:07 PM

268 Comments

my experience with the two pack from costco is that they fail after a couple years. warranty replaces them, but then the replacements seem to fail after about 2 years... maybe it's the air around here...

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First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup and Voice & Location Alerts, SMCO100V-AC, 3-Pack $148

$148

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