Stay connected with the 4G LTE Samsung Galaxy Watch – with two sizes to choose from. Go nonstop for days on a single charge. LTE connectivity provides a true standalone experience. Stay in touch without your phone and manage one number with AT&T NumberSync. Make calls, send texts, stream music and more - even if your smartphone isn't with you or powered on. And keep your mind and body in balance with wellness features. Integrated sleep cycle tracking monitors all levels of sleep, including REM cycles. Select workouts for automatic detection, set reminders to hydrate and enjoy guided meditation and breathing exercises to help destress.