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Think of buying the Roost Smart Smoke Alarm like buying a dumb alarm packaged with a smart battery. If you need both, it's worth a purchase, but if you only want smarts, get the battery on its own.

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The RSA-400 looks like your ordinary, everyday smoke detector. The included Roost Smart Battery enables it to connect to your Wi-Fi network, and that’s how it sends alerts to your smartphone if the ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Roy Furchgott We’ve added full reviews of our new picks: The Kidde Smart Smoke ...