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10 Best first alert smoke detectors of 2026

Save up to 22% off
  • Best Choice

    1

    First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 6-Pack
    First Alert
    Available in: 4 sizes
    9.9
    Exceptional

    First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup, 6-Pack

    • product dimensions: 5.6D x 5.6W x 1.9H
    • color: White
    • batteries: 1 9V batteries required. included
    • pattern: 2nd Generation
    • item weight: 3.33 pounds
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  • Value for Money

    2

    First Alert Smoke Alarm, Interconnect Hardwire Detector with 10-Year Battery Backup, SMI105-AC, 6-Pack
    First Alert
    9.7
    Exceptional

    First Alert Smoke Alarm, Interconnect Hardwire Detector with 10-Year Battery Backup, SMI105-AC, 6-Pack

  • 3

    First Alert BRK SMI100-AC Hardwired Smoke Detector with Battery Backup, 6-Pack
    First Alert
    9.6
    Exceptional

    First Alert BRK SMI100-AC Hardwired Smoke Detector with Battery Backup, 6-Pack

    • product dimensions: 2.2D x 5.6W x 5.6H
    • color: White
    • batteries: 1 9V batteries required. included
    • item weight: 9.6 ounces
    • upc: 029054019387 029054019226

  • 4

    FIRST ALERT SC9120B Corded Electric Combination Alarm with Adapter Plugs for Easy Replacement
    First Alert
    Available in: 2 styles
    9.4
    Excellent

    FIRST ALERT SC9120B Corded Electric Combination Alarm with Adapter Plugs for Easy Replacement

    • product dimensions: 0.07D x 0.22W x 0.22H
    • color: Red
    • batteries: 1 Lithium Metal batteries required. included
    • pattern: Alarm
    • item weight: 10.1 ounces

  • 5

    First Alert SMI100-AC, Hardwire Interconnect Smoke Alarm with Battery Backup, 6-Pack
    First Alert
    Available in: 3 sizes
    9.1
    Excellent

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

  • See Today’s Deals & Prices

  • 6

    First Alert SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup 2 Pack
    First Alert
    9.0
    Excellent

    First Alert SC-9120B Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup 2 Pack

    • product dimensions:N/A
    • color: 2 Units Sc-9120b
    • batteries: 1 9V batteries required.
    • item weight: 1.34 pounds
    • upc: 716123248617

  • 7

    First Alert BRK SMI100-AC Hardwired Smoke Alarm with Battery Backup, Contractor 6-Pack
    First Alert
    8.9
    Very Good

    First Alert BRK SMI100-AC Hardwired Smoke Alarm with Battery Backup, Contractor 6-Pack

    • product dimensions: 1.9D x 5.6W x 5.6H
    • color: White
    • batteries: 1 9V batteries required. included
    • item weight: 3.48 pounds
    • upc:N/A

  • 8

    First Alert BRK Smoke Alarm, Interconnect Hardwire Detector with 10-Year Battery Backup, SMI105-AC, 3-Pack
    First Alert
    Available in: 2 sizes
    8.8
    Very Good

    First Alert BRK Smoke Alarm, Interconnect Hardwire Detector with 10-Year Battery Backup, SMI105-AC, 3-Pack

    22% Off
    • product dimensions:‎5.5"D x 2"W x 5.5"H
    • color:‎White
    • batteries:‎1 9V batteries required. (included)
    • item weight:‎11.2 ounces
    • upc:‎029054022622

  • 9

    First Alert 9120B 120 Volt Hardwired Smoke Alarm With Battery Back Up 5 Pack
    First Alert
    8.5
    Good

    First Alert 9120B 120 Volt Hardwired Smoke Alarm With Battery Back Up 5 Pack

    • product dimensions:N/A
    • color: 5 Units 9120B
    • batteries:N/A
    • item weight: 0.01 ounces
    • upc: 029054246691

  • 10

    First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack
    First Alert
    Available in: 4 sizes
    8.4
    Good

    First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack

    • product dimensions:‎21.5 x 7.5 x 3.5 inches
    • color:‎White
    • batteries:‎1 9V batteries required. (included)
    • pattern:‎SMICO100-AC
    • item weight:‎1.68 pounds

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