First Alert 9120B BRK Hardwire Smoke Alarm with Battery Backup

• 120V AC with battery backup

• Side load battery drawer

• Tamper resistant locking pins - Universal mounting bracket

• Test/silence button

• Latching alarm indication

The 120V AC Smoke Alarm with Battery Backup is designed to install faster; perform better; and be even smarter than before. Ionization sensor. These improvements help reduce nuisance alarms and save you time and money. Uses 9V batteryfor Battery Back up.