First Alert 9120B Hardwired Ionization Smoke Alarm with Battery Backup

Designed to help promote household safety, the First Alert Hardwired Ionization Smoke Alarm with Battery Backup can provide early warning of fire. This hardwired smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast-flaming fires. Features: 120-volt hardwired smoke alarm wires directly into your home's electrical system Ionization smoke sensor reliably detects particles from fast-flaming fires Can integrate with up to 12 other First Alert or BRK hardwired smoke detectors Easy-to-access battery compartment; 9-volt battery included Hassle-free installation, no need to rewire