Nest Protect V2 is an updated version of the smart smoke alarm we’ve tested previously – some five years ago. This is an intelligent smoke alarm that ties into the Nest ecosystem and is packed full of sensors and technoloy designed to keep you and your loved ones safe.
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https://www.pocket-lint.com/smart-home/reviews/nest/146184-nest-protect-v2-review-the-best-smart-smoke-alarm