UP4 by Jawbone Heart Rate Activity Sleep Tracker - Silver Cross -

You can connect your UP4 band to an eligible American Express Card for payments on the go at participating stores.One size fits most wrist sizes ranging 5.5 in-7.4 in Heart health monitoring throughout the day.Get personalized guidance from Smart Coach Advanced sleep tracking automatically to capture REM Light and Deep Syncs wirelessly plus 7 days battery life.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.