BRK SC9120B First Alert Smoke & Carbon Monoxide Alarm, Hardwired, 9V Battery

by BRK
Save 20%


The BRK SC9120B First Alert smoke & carbon monoxide alarm is a 120V AC/DC, hardwired smoke and carbon monoxide alarm with battery backup and an 85db horn. This BRK combo smoke & carbon monoxide is designed to reduce false alarms. Capable of being interconnected with up to 18 devices (12 can be smoke alarms) its latching alarm indication recalls which unit triggered the alarm in the series. Its red LED indicator flashes rapidly. Afterwards, the BRK combo alarm stores it into memory and then flashes every two seconds. Simply put, the BRK SC9120B is state of the art smoke and carbon monoxide detection that meets new construction requirements.

Due to its two locking features, the BRK SC9120B smoke and carbon monoxide alarm locks the battery drawer and alarm to the base to prevent authorized tampering. Its ideally suited for apartments, hotels, dorms, or multi-family dwellingsThe First Alert SC9120B BRK smoke and carbon monoxide alarm eliminates the need for two separate devices; saving time and money. Its single test/silence button is combined making it extremely easy to use.

The First Alert SC9120B mounting system makes installation a cinch. It includes a gasket-less base for easy installation and ensures perfect alignment within minutes.The BRK SC9120B smoke alarm can be interconnected so if one unit senses smoke, all units alarm. Connecection to AC power is fast and easy with a quick connect wiring harness.


  • 9V Battery Backup
  • Fast Installation, Minimal Downtime
  • Indicator Lights for Power
  • Interconnectable up 18 Smoke Devices; 12 can be smoke alarms
  • Dust Cover
  • Easy Alignment of Alarm
  • End of Life Sound Notification
  • Hassle-Free Maintenance
  • Photoelectric Sensor Saves Maintenance Calls
  • Silences Unwanted False Alarm
  • Silences Low Battery Chirps For Up to 8 Hours
  • Single Silence/Test Button


  • Alarm Strength 85dB at 10 Feet
  • Dimensions: 5.58" Diameter x 1.97" H
  • Dual Ionization CO Sensor Metal Oxide
  • Humidity Range: 10% - 90% relative humidity
  • 120V AC w/ 9V battery Back-Up
  • 09 Amps
  • Dual Chamber Ionization Sensor
  • 40 degrees F to 100 degrees F Operating Temperature
  • Quick Connect Plug With 8" pigtails
  • Replaces Discontinued BRK smoke alarm models 4120, 4120B, 86RAC
  • Weighs 8.5 ounces


7 year warranty through BRK Electronics

You recently viewed

Clear recently viewed