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Visit Our Store navigation AC-DC Lighting Video Car Categories First Alert BRK SC9120B & Carbon Monoxide w/ Ask Question Information First Alert (2 pack) BRK Smoke & Carbon Alarm Battery Brand: Condition: First Alert SC9120B Smoke and includes 9-volt backup that protect you in the event of failure. alarm electrochemical an for smoke detection, an silences nuisance and detector functions, lights if smoke The latching alarm automatically initiated after set off have subsided.