Take calls text listen to music and more. Sleep app shows REM Core or Deep sleep and other trends. Heart Rate app - see high or low heart rate or irregular rhythm. View metrics of workouts strength training and other workouts. Water resistant to 50 M. Activity rings - more moving and motivating. Smart Stack with Vitals app Translate app and Cycle Tracking. Battery life up to 18 hours of use. Silver aluminum case size: 40mm x 34mm x 10.7mm. Blue Cloud sport loop fits wrists 130-200mm in circumference. Includes Magnetic charger to USB-C cable.