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10 Best first alert dual sensors of 2026

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  • Best Choice

    1

    First Alert Interconnect Hardwire Dual Sensor Smoke Alarm with Battery Backup, SM300-AC, 6-Pack
    First Alert
    Available in: 3 sizes
    9.8
    Exceptional

    First Alert Interconnect Hardwire Dual Sensor Smoke Alarm with Battery Backup, SM300-AC, 6-Pack

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  • Value for Money

    2

    FIRST ALERT BRK SC9120B-3 Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, White, Pack of 3
    First Alert
    Available in: 4 sizes
    9.7
    Exceptional

    FIRST ALERT BRK SC9120B-3 Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, White, Pack of 3

    • product dimensions: 1.9D x 5.6W x 5.6H
    • color: White
    • batteries: 2 AA batteries required. included
    • pattern: Detector
    • item weight: 11.2 ounces

  • 3

    First Alert Smoke Alarm, 10-Year Sealed Battery Dual Sensor Detector with Test & Silence Button, SM310, 1-Pack
    First Alert
    Available in: 3 sizes
    9.4
    Excellent

    First Alert Smoke Alarm, 10-Year Sealed Battery Dual Sensor Detector with Test & Silence Button, SM310, 1-Pack

    15% Off

  • 4

    First Alert Interconnect Hardwire Dual Sensor Smoke Alarm with Battery Backup, SM300-AC, 3-Pack
    First Alert
    Available in: 3 sizes
    9.3
    Excellent

    First Alert Interconnect Hardwire Dual Sensor Smoke Alarm with Battery Backup, SM300-AC, 3-Pack

  • 5

    First Alert SM300-AC, Interconnect Hardwire Dual Sensor Smoke Alarm with Battery Backup, 1-Pack
    First Alert
    9.2
    Excellent

    First Alert SM300-AC, Interconnect Hardwire Dual Sensor Smoke Alarm with Battery Backup, 1-Pack

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  • 6

    First Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm - 3 Pack
    First Alert
    Available in: 2 sizes
    9.1
    Excellent

    First Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm - 3 Pack

    • product dimensions: 21.5 x 7.5 x 3.5 inches
    • color: White
    • batteries: 2 AA batteries required. included
    • pattern: SMCO100
    • item weight: 1.55 pounds

  • 7

    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

    • color: 2 Units Sc-9120b
    • batteries: 1 9V batteries required.
    • item weight: 1.34 pounds
    • upc: 716123248617
    • batteries included: No

  • 8

    First Alert SMCO110LED-AC, Hardwire Combination Smoke & Carbon Monoxide Alarm with LED Strobe & 10-Year Battery Backup, 1-Pack
    First Alert
    Available in: 2 styles
    8.7
    Very Good

    First Alert SMCO110LED-AC, Hardwire Combination Smoke & Carbon Monoxide Alarm with LED Strobe & 10-Year Battery Backup, 1-Pack

  • 9

    Kidde Hardwired Carbon Monoxide Detector with 9-Volt Battery Backup, Digital LED Display 5.75 diameter x 1.8 depth
    Kidde
    Available in: 2 sizes
    8.6
    Very Good

    Kidde Hardwired Carbon Monoxide Detector with 9-Volt Battery Backup, Digital LED Display 5.75 diameter x 1.8 depth

    • color: Multi
    • compatible devices: Up to 24 Kidde devices of which 18 can be initiating
    • pattern: Detector
    • batteries included: Yes
    • item model number: KN-COP-IC

  • 10

    First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 3-Pack
    First Alert
    Available in: 4 sizes
    8.3
    Good

    First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMICO100, 3-Pack

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