Sapphire crystal lens is incredibly scratch-resistant with a hardness just below that of a diamond. 10 ATM waterproof rating. Navigate your world with multi-GNSS satellite reference and outdoor sensors. Wrist-based heart rate and Pulse Ox sensors add insight to your fitness activities. Dynamic PacePro feature helps you run smarter over various types of terrain. Preloaded ski maps for more than 2,000 resorts around the world. Measure running and cycling performance in ways you didn't know were possible. Sync your favorite streaming services, and listen to music without your phone. Auto goal (learns your activity level and assigns a daily step goal). Sleep monitoring (monitors total sleep and periods of movement or restful sleep). Features step counter, calories burned, floors climbed, distance traveled, and intensity minutes. Imported.