Long Battery Life: Up to 30 days of use on a single charge. Auto Brightness Adjustment: Always On Display with auto brightness adjustment when you turn your wrist. Full Fitness Functions: Counts daily steps and calories burned, conduct training sessions while biking, walking or running, tracks progress and goals. Sleep Tracker: Tracks hours slept, Deep Sleep, Shallow Sleep and number of times you wake up. Stay Up to Date: Easily receive notifications, calls and messages