First Alert Hardwired 120V Electrochemical/Ionization Carbon Monoxide and Smoke Alarm (6-Pack)

6-pack contractor pack combination carbon monoxide and smoke alarm. Can connect to other compatible BRK or First Alert CO and smoke detectors. Light indicates if the alarm is for smoke or for carbon monoxide. Single test/silence button for simple operation. Hardwired combination CO and smoke alarm features battery backup for constant monitoring.