BRK First Alert 9120BFF/SMI100-AC Smoke Detector – Hardwired with Battery Backup

Overview

Meet the BRK 9120BFF/SMI100-AC smoke detector—a 120-volt hardwired alarm with a reliable 9-volt backup battery. It uses an ionization sensor to respond quickly to fast flaming fires and emits a clear 85 dB alarm to alert your household. Designed for straightforward installation and minimal upkeep, it features a gasketless base and a secure mounting bracket to help ensure precise alignment, even during renovations.

Smart interconnectivity for whole-home awareness

This model can connect with up to 12 other BRK or First Alert hardwired alarms, plus up to six compatible devices such as bells or horns. When smoke is detected by any unit, all linked alarms sound, and a latching indicator identifies the initiating unit so you know where to look.

Key features at a glance

• 120V AC power with 9V battery backup to maintain monitoring during power outages
• Ionization sensing for fast flaming fires
• 85 dB horn provides a clear, attention-grabbing alert
• Gasketless base and universal mounting bracket for fast, precise installation
• Tamper-resistant locking brackets and a dust cover for durable setup
• Single test/silence button to verify function or mute non-threatening alerts
• UL 217 compliant; 10-year limited warranty; listed with the California State Fire Marshal

Best practices for placement and use

• Place one detector on each level and in sleeping areas for broad coverage
• Avoid mounting near kitchens or bathrooms to minimize nuisance alarms
• Test regularly to ensure proper function and interconnection

What’s in the box

• One BRK First Alert 9120BFF/SMI100-AC smoke detector
• One 9-volt backup battery
• User’s manual

Why choose BRK

BRK electronics blend a safety heritage with practical, user-friendly design. This unit emphasizes reliable performance, easy installation, and dependable operation across home environments and multi-level layouts.