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This unit is designed to be compatible with: First Alert® Smoke Alarm Models SA4120, SA4121B, SA100B,. SA520 and BRK® Smoke Alarm Models 9120, 9120B, SC6120B,. The BRK First Alert SC9120LBL Combination Smoke Carbon Monoxide Alarm is one of the most affordable combination smoke & carbon monoxide detectors.Online Manuals for Popular Models. Review the chart to find manuals for common First Alert, Onelink, and BRK products. If your model isn't listed here, follow Amazon.com: First Alert BRK SC9120LBL Hardwired Smoke and Carbon Monoxide (CO) Detector with 10 Year Sealed Battery Backup , White : Everything Else. The page is about user manuals, installation instructions, specifications, pictures and questions and answers of First Alert BRK SC9120LBL. Learn what to do if your smoke alarm is chirping even after you install Learn where to locate the Test/Silence button on your First Alert or BRK alarm. Up to 18 units of First Alert or BRK Smoke, CO and Heat Alarms. Maximum of 12 smoke alarms. See user's manual for details. Smoke Sensor: Dual Ionization. CO