Hardwired Smoke Detector with Battery Backup

The First Alert 9120BFF Hardwired Smoke Alarm with Battery Backup is designed to promote greater household safety. Equipped with an ionization smoke sensor, this 120-volt AC smoke detector reliably detects smoke from hot, fast-flaming fires and alerts you with a loud 85-decibel alarm. Featuring a backup battery, the hardwired smoke alarm continues to function even during power outages, ensuring constant monitoring for your family's protection.

To ensure complete protection, the smoke alarm can be interconnected with up to 12 other compatible BRK or First Alert smoke detectors, so that all alarms will sound when smoke is detected. The single test/silence button allows you to easily check the alarm's functionality and mute false alarms, while the gasketless mount and tamper-resistant locking pins facilitate a secure and easy installation.

The revolutionary BRK 9120 series smoke alarms have been redesigned from the ground up, with improved performance and smart technology to reduce nuisance alarms, saving you time and money. BRK Electronics smoke alarms are engineered for years of virtually maintenance-free service, with features that make them easy to install and maintain.

The 9120B AC-powered smoke alarm with battery backup includes an ionization sensor to detect fast-flaming fires, 120-volt AC interconnectability (with up to 18 compatible devices), and a latching alarm indicator that identifies the unit that triggered the alarm. The smart technology helps reduce nuisance alarms, while the 9-volt battery backup ensures the alarm continues to function during power outages.

The perfect mount system, including a gasketless base and new mounting bracket, ensures easy installation and secure alignment. Tamper-resistant locking pins and a mounting bracket lock provide added security, while the dust cover keeps the unit clean during construction. With a 10-year limited warranty, this smoke alarm meets the UL 217 standard and is listed with the California State Fire Marshal, utilizing the new UL-mandated repeating 85-decibel alarm horn pattern.

First Alert, the most trusted brand in home safety since launching the first residential smoke alarm in 1958, offers this hardwired smoke alarm with battery backup to keep your family safe. The easy-to-install design and quality-engineered construction make it the perfect choice for faster turnarounds on job sites, providing the most trusted alarms in home safety.

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