BRK Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup - SC9120B

BRK Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup - SC9120B Add dependable smoke and carbon monoxide protection with this BRK Hardwired Smoke and Carbon Monoxide Alarm with Battery Backup - SC9120B. This alarm provides hardwired safety monitoring with battery backup for continued protection during power outages. SC9120B is selected by alarm type, power source, interconnect requirements, and code needs rather than by appliance model number. Compatibility: This is a residential safety product that must be matched by power source, alarm type, and interconnect requirements. Please confirm the alarm type, wiring configuration, and battery-backup requirement before ordering. When should you replace it? Common Symptoms: End-of-life signal, nuisance alarms, or replacement of an aging detector. Visible/Sensory Cues: Expired alarm date, chirping, fault indicators, or failed self-test behavior. Pro Tip: Always follow local code requirements and manufacturer instr