There are plenty of smart smoke detectors on the market that connect to your home's Wi-Fi network to provide smartphone notifications when there's trouble, but they're an expensive upgrade to the dumb smoke detector you've (hopefully) already got watching over your home. The $40 Roost promises pretty much the same functionality as those smart alternatives, but on the cheap, upgrading only the 9-volt battery your smoke or carbon monoxide detector already relies on.
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