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10 Best first alert brk 9120bs 3 of 2026

Save up to 31% off

  • 1

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

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

    30% Off
    9.8
    Exceptional
    Our Rating
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  • 2

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

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

    20% Off
    9.7
    Exceptional

  • 3

    First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack
    First Alert

    First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 3-Pack

    25% Off
    9.5
    Excellent

  • 4

    First Alert BRK SMI100-AC Hardwired Smoke Alarm with Battery Backup (3)
    First Alert

    First Alert BRK SMI100-AC Hardwired Smoke Alarm with Battery Backup (3)

    9.4
    Excellent

  • 5

    BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
    BRK

    BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack

    9.1
    Excellent
    Our Rating
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  • 6

    First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack
    First Alert

    First Alert 9120B Smoke Detector, Hardwired Alarm with Battery Backup, 6-Pack

    • color:White
    • batteries:1 9V batteries required
    • power source:Battery Powered
    • alarm:Audible
    • style:9120B
    8.9
    Very Good
    Our Rating

  • 7

    BRK First Alert Smoke Alarm, Interconnect Hardwire Detector with Battery Backup, SMI100-AC, 3-Pack
    First Alert

    BRK First Alert Smoke Alarm, Interconnect Hardwire Detector with Battery Backup, SMI100-AC, 3-Pack

    31% Off
    8.8
    Very Good

  • 8

    First Alert Smoke Detector Alarm | Hardwired with Backup Battery, BRK9120b6CP and First Alert BRK 9120B-3 Hardwired Smoke Alarm with Backup Battery, 3 Pack
    First Alert

    First Alert Smoke Detector Alarm | Hardwired with Backup Battery, BRK9120b6CP and First Alert BRK 9120B-3 Hardwired Smoke Alarm with Backup Battery, 3 Pack

    8.7
    Very Good

  • 9

    First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup
    First Alert

    First Alert BRK SC-9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup

    30% Off
    • batteries:1 9V batteries required
    • power source:Battery Powered
    • alarm:Audible
    • style:10-year limited warranty
    • sensor:Ionization
    8.5
    Good
    Our Rating

  • 10

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

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

    24% Off
    8.4
    Good