First Alert 9120B


Hardwired Smoke Alarm with Battery Backup

Availability: Please Call for Availability

  • Factory New
Brand: First Alert Part #: 17020 Category: Manufacturer Part #: 9120BSecondary Part #: 1039939


Enhance your household’s fire safety and enjoy greater peace of mind with the First Alert BRK Hardwired Smoke Alarm with 10-year Battery Backup. Equipped with an ionization sensor, this 120-volt hardwired smoke alarm reliably detects smoke from fast-flaming fires and alerts you with an 85-decibel alarm. Included adapter plugs eliminate the need for re-wiring during installation, while a backup 10-year battery helps keep the unit running in case of a power outage. Designed to maximize accessibility and ease of use, this hardwired smoke detector features a single button that allows you to test and silence the alarm. And thanks to the universal mounting bracket, this smoke alarm is easy to install.


Weight .6 lbs
Dimensions 5.6 × 1.9 × 5.6 in



First Alert

Production Status



  • Hardwired ionization smoke alarm with 10-year battery back up
  • Includes adapter plugs that eliminate the need for re-wiring if you are replacing an existing, non-First Alert branded detector
  • Battery backup provides consistent protection for added safety during power outages
  • Latching alarm indicator remembers which unit initiated an alarm
  • Perfect mount – allows for easy alignment of alarm
  • Smart technology helps to reduce the number of nuisance alarms
  • Single button test/silence helps to ensure your alarm is working properly


First Alert – Data Sheet