One size fits most, wrist sizes ranging 5.5in-7.4in,Heart health monitoring throughout the day
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Advanced sleep tracking automatically to capture REM, Light and Deep
Android compatibility - UP2, UP3 and UP4 are compatible with Android 4.3 (Jelly Bean) or later.
iOS compatibility - UP2, UP3 and UP4 are compatible with the following iOS devices:iPhone 4S or newer, iPod Touch 5th generation or newer, iPad 3 or newer, iPad Mini 1st generation or newer, iPad Air 1st generation or newer