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Roost, the company that has made a Wi-Fi-enabled 9-volt battery that you can pop into a smoke detector, has launched a Kickstarter campaign to get its product into the hands of consumers. The battery contains a noise sensor that can hear if your smoke alarm goes off and send that information to an accompanying app, essentially turning your old smoke alarm into a smart alarm for between $25 and $35. The batteries will ship in June 2015, so there’s a wait, but I’m really excited about the low-power Wi-Fi technology built into the battery as well as the retrofit.