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It has to be pretty recent, only 4.3 or later are compatible. Since Android Wear (a modified version of Android) is the open source software and dev kit is used by many of the big manufacturers like LG and Samsung, that’s going to be an issue with many devices. You might also want to look at Sony’s SmartWatch 2, which will work on devices running 4.0 or newer. I’m not so sure about Pebble - I know it works with iOS 7, but I don’t know about the Android requirements for Pebble.