Photo 1 of **It's used, it's missing a part, and it's not known if it works 100%.***First Alert SMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack

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Photo 1 of **It's used, it's missing a part, and it's not known if it works 100%.***First Alert SMCO210, 10-Year Sealed Battery Combination Smoke & Carbon Monoxide Alarm with Slim Profile Design, 1-Pack