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Alert staff and customers to potential hazards with this First Alert photoelectric smoke and carbon monoxide alarm. A built-in battery delivers 10 years of reliable operation, eliminating the need for frequent battery replacement. The photoelectric sensor detects smoke while minimizing the risk of false alarms, and the electrochemical sensor detects elevations in carbon monoxide levels. With its low-profile design, this First Alert photoelectric smoke and carbon monoxide alarm blends seamlessly with your walls or ceiling.