First Alert Combination Smoke/Carbon Monoxide alarm battery included $23.47

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Model No SCO2 is a battery powered single station combination smoke and carbon monoxide alarm specifically designed for residential and institutional applications.

9V battery powered, an 85dB horn, an End of Life and a silence feature.

https://www.amazon.com/gp/aw/d/B0…0DER&psc=1

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