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Nest Protect Is A $129 Smoke And Carbon Monoxide Detector That Takes Nest Deeper Into The Connected Home | TechCrunch
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Kidde Smart Smoke and Carbon Monoxide Detector with Indoor Air Quality Monitor, Hardwired, 10-Year Lithium Backup Battery 21030843 - The Home Depot
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Kidde Firex Plug-in Carbon Monoxide Detector, 9-Volt Battery Backup and Digital Display, CO Detector 21029915 - The Home Depot
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