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Charge:There is built-in USB port for charging on watch.
Scan the QR code to download app into your phone. Pair watch through app on your phone
Function:pedometer, sleep monitor SMS notification call reminder etc
For IOS 7.1 or above (iPhone 4S, iPhone 5/5S/5C, iPhone 6/6S plus, iPhone 7/7S plus,etc.) For Android 4.4 or above