First Alert 3120B Hardwire Dual Sensor Smoke Alarm with Battery Backup

The First Alert Hardwired Dual Sensor Smoke Alarm with Battery Backup is designed to provide peace of mind. The photoelectric and ionization sensors alert you to both smoldering and fast-flaming fires, offering comprehensive detection and early warning. The 85-decibel fire alarm can also connect to other compatible hardwired fire detectors for larger spaces. Features: Photoelectric and ionization sensors provide comprehensive fire detection A single button makes alarm easy to test, or silence during a false alarm Hardwired alarm includes battery backup for detection during power outages Connect with other compatible hardwired alarms to create a safety network