Hardwired Ionization Smoke Alarm with Battery Backup

This Hardwired ionization smoke alarm is best at detecting fast flaming fires. The SA9120BCNA features battery backup for full protection during power outages, an adapter for easy replacement of other branded alarms and a mute/silence button to quiet false alarms. The alarm is also equipped with an easy access battery drawer allowing batteries to be changed without removing the alarm from the ceiling. 10-year limited warranty.


The First Alert® hardwired smoke detectors are alarms wired directly into your homes electrical system and include battery backup and mute button. Hard-wired smoke detectors with battery backup ensure that alarms work even during power outages. Hardwired alarms can integrate with up to 12 other First Alert® or BRK™ brand wired alarms.





  • Kitchen
  • Bedroom
  • Indoors
  • Ionization smoke sensor - Detects Fast Flaming Fires
  • Battery backup - For Protection During Power Outages
  • Mute/Silence Button
  • Easy access battery door
  • Optional theft-prevention lock protects the detector
  • Easy Plug Wiring Adapter
  • Loud 85db Siren
  • 9V Backup Battery Included
  • 10-Year Limited
Warranty Claim10-Year Limited