Roost Smart Battery

Add network connectivity to your existing smoke alarm

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This is pretty brilliant. It's a rechargeable battery that can connect to WiFi, and send alerts to your smartphone through the web. Pop it into your smoke alarm, and voila; you've got a smart smoke alarm. It's also WAY cheaper than Nest Protect
Another interesting note: it also uses the yet-to-be-finalized 802.11ah low-power WiFi standard
this is pretty cool. i love that i don't have to replace my existing smoke alarm to use it!