First Alert SC9120B


Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup

Availability: Please Call for Availability

  • Factory New
Brand: First Alert Part #: 16988 Categories: , Manufacturer Part #: SC9120BSecondary Part #: 1039807


The First Alert Hardwired Combination Smoke and Carbon Monoxide Alarm detects both carbon monoxide and smoke in a single device. It is designed for hardwired installation but features a 10-year battery backup that allows the unit to function in the event of a power outage. The CO smoke detector can be connected to other compatible BRK or First Alert CO smoke detectors within a single-family residence. A single button silences or tests the unit.



Weight 1.00 lbs
Dimensions 5.6 × 1.9 × 5.6 in



First Alert

Production Status



  • Keep your family safer with this hardwired smoke and carbon monoxide alarm; the 10-year battery backup means constant monitoring for the life of the alarm even if there’s a power failure
  • Features an electrochemical carbon monoxide sensing technology as well as intelligent smoke sensing technology to reduce nuisance alarms.
  • Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85-decibel siren provides a clear, loud warning upon detection
  • Simple to use, with a single test/silence button; included 10-year lithium battery features a locked drawer to prevent tampering
  • Adapter plugs are included to save you the hassle of rewiring and to simplify installation
  • 10-Year limited warranty; equipped with end-of-life chirp, so you know when it’s time to replace the unit for your safety
  • Rigorously tested to meet UL standards


First Alert – Data Sheet