AC Smoke Alarm 

•  Direct wired with 9V battery backup, wired with battery backup for protection during power outages.

• Perfect mounting for easy installation, the mounting bracket keeps the alarm secure in a wide range of rotation for ideal alignment.
  

• Lockout alarm indicator, visually identifies the unit that initiated the alarm or low battery.
  

• Interfaces with most First Alert and BRK wired alarms; When an alarm sounds, all supported alarms sound (up to 12 smoke alarms and 6 other alarms).
  

• Test/Silence Button Temporarily silence or test the alarm with an easy-to-access, one-touch button.
  

• Dust cover keeps alarm clean during construction.
  
  Replacement of Model 9120B