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BRK First Alert 9120BFF/ SMI100-AC Smoke Detector, Hardwired Alarm with Battery Backup, White, 1-Pack
ASIN: B00O8MVW3U

by BRK

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

8.8
Confidence High

ExpertBeacon Score and confidence are proprietary signals, not retailer ratings.

4.6Amazon rating(19.1K+ reviews)
Demand Top 60%
Confidence High
Lower-Priced in Set

How It Compares

Compared with other products in Smoke Detectors & Fire Alarms.

Demand
40%
Expert Score
69%
Relative Price
Lower-priced

Relative Price shows where this product sits in the category. Exact prices stay hidden.

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Affiliate Disclosure — We earn from qualifying purchases. Data last updated on Mar 23, 2026. ExpertBeacon Score, Expert Score, Value, and Confidence are our own signals, not retailer ratings.

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Product Features

  • Keep your family safe with this hardwired smoke alarm the battery backup means constant monitoring, even if there's a power failure
  • Equipped with an ionization sensor, this smoke alarm reliably detects smoke from fast flaming fires and alerts you with an 85 decibel alarm
  • To ensure complete protection make sure to place one on each level of your home and in each bedroom
  • Can connect to other compatible BRK or first alert smoke detectors, to ensure all alarms will sound when smoke is detected
  • Simple to use, with a single test/silence button, and side load battery compartment tamper resistant locking brackets and universal mounting brackets make installation easy
  • Rigorously tested to meet UL standards120 volt AC power with 9V battery backup to keep alarm functioning during power outage
  • First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
  • Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety

Why It Ranked Well

Competitive Value

Value is benchmarked using expert score and hidden price position in this set.

High Confidence

Listing completeness and demand coverage are both strong for this product.

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