Auto transitions among swimming cycling and running and records for each. Features powerful compass offline maps and route creation. Certified to EN13319 for diving or water sports. Vital insights Sleep app ECG app and Cycle Tracking. Cellular - use preferred carrier plan to stay in touch without a phone. Up to 36 hours of battery life. Black titanium case with flat sapphire crystal. Case size: 49mm x 44mm x 14.4mm. Large Black Titanium Milanese loop fits wrists 180-210mm in circumference. Includes Magnetic fast charger to USB-C cable.