The Roost 9V Smart Battery takes an existing smoke or CO2 detector and makes it “smart” enough to send alerts to a smartphone. The $35 lithium Roost is the same size as a standard 9V battery, but has a Wi-Fi adapter on the bottom which links to a home network. If the alarm goes off, the Wi-Fi adapter wakes up and sends an alert through the cloud to all linked smartphones and tablets. A free app monitors the battery’s status and lets users share smoke-alarm alerts with friends and neighbors. A $65 Roost two-pack is also available.
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