The original Nest Protect combination smoke and carbon monoxide alarm aims to make that alarm in your house "less annoying." Consumer Reports tested it in February 2014.
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Google Nest Protect (2nd gen) tested: The carbon monoxide and smoke detector with app
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Google Nest Protect smoke alarm review
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Testing the Nest Protect
Nest does for smoke detectors what it did for the thermostat
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Nest Protect smoke and carbon monoxide detector review
Nest – working by hand
Meet Nest Protect., There’s never been a smoke and CO alarm quite like this. Nest Protect looks for fast-burning fires, smoldering fires, and carbon
Google 2nd Generation Battery Powered Nest Protect Detectors