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BRK First Alert SMICO100-AC "Replacement For SC9120B" Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm With Battery Backup

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First Alert Electrochemical Smoke & Carbon Monoxide Detector 8.45 H X 6.75 W X 3.55 D In Black | 8.45" H X 6.75" W X 3.55" D | Wayfair