The Roost Smart Battery works in smoke and combined smoke/carbon monoxide (CO) alarms that use a 9-volt battery, including AC-powered smoke alarms with a 9V battery for backup power. Your smoke alarm needs to be within range of a Wi-Fi network that you have access to. You'll also need a smartphone running iOS 8.0 or Android 4.2 (or higher) operating systems. Lastly, you'll need to install the free Roost iOS or Android app on your smartphone.
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