If you’re looking for a reliable smart smoke and CO detector without shelling out close to $100+ then Roost’s Wi-Fi battery is the way to go. The Roost Smart Battery retrofits to your existing alarm and gives you smartphone notifications when there’s a problem.

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Compared to the competition, Nest Protect 2.0 is by far the best smoke and carbon monoxide detector on the market today. Whether it’s activating the convenient in-app “silence” feature or its full integration with other smart devices, Nest’s second-generation smoke detector comes with all of the bells and whistles.

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