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

Grow your home safety with the First Alert 9120B Smoke Detector 6-Pack. This set combines hardwired protection and a reliable 9-volt battery backup, helping maintain alert coverage across your home even during outages. Thoughtfully designed for multi-level layouts, it supports straightforward installation and ongoing awareness without complicated maintenance steps.

At the heart of the unit is an ionization sensor that effectively detects fast flaming fires, accompanied by a loud 85-decibel alarm to prompt quick, decisive action. Everyday use is simple thanks to a single test/silence button and a side-loading battery compartment, making routine checks and minor adjustments hassle-free. A visible indicator light provides at-a-glance confirmation when smoke is detected, while a latching alarm indicator helps identify which unit triggered the alert, even after conditions have calmed. An end-of-life signal serves as a clear reminder to plan for replacement, helping you maintain continuous coverage over time.

Connected protection you can count on

• Interconnect capability with compatible BRK or First Alert detectors ensures all alarms sound when one is triggered, creating a unified alert network for the whole home.
• Universal mounting and tamper-resistant locking brackets simplify installation and help secure the devices in place.
• Hardwired 120-volt power supply paired with battery backup maintains monitoring during power outages.
• UL-tested performance with a reliable T3 notification pattern to maximize audible clarity during emergencies.

Practical use and maintenance tips

Place detectors on each level of your home and in bedrooms or sleeping areas to improve early detection. The latching indicator and end-of-life signal support ongoing safety planning, while the single button keeps routine testing and silencing straightforward. Regular checks of wiring polarity and secure connections can help prevent nuisance issues, and easy battery access means you can refresh power without dismounting the unit.

Real-world scenarios emphasize practical benefits: a reliable power backup limits gaps in coverage during outages, automatic interconnections ensure a coordinated response across rooms, and a clear alarm and indicator system helps occupants respond calmly and promptly. While results can vary based on home layout and installation quality, these features are designed to provide dependable, user-friendly protection that complements existing safety routines.

What you get with the 6-pack

• Six hardwired detectors with battery backup for continuous coverage
• Mounting brackets and hardware for quick setup
• Interconnect capability to synchronize alarms across the home
• Visual and audible cues, including a latching indicator and 85 dB alarm

Note: Proper wiring polarity and secure connections are important for optimal function. This product is designed for installation alongside other compatible First Alert or BRK alarms within a single residence.