Cellular capability - stay connected without your phone nearby. Crack, dust and water resistant. Temperature sensing. Cycle tracking with encryption. Sleep app - shows REM, Core or Deep sleep. Take an ECG or measure blood oxygen levels. High and Low HR and irregular rhythm notifications. Crash and Fall Detection. Workout app. Water resistant to 50 M. Ion-X glass display with red aluminum case. Red sport band with pin-and-tuck closure. M/L Band fits 160-210mm wrists. Case size: 45mm x 38mm. Includes Magnetic Charger to USB-C cable.