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About this item Specialized features, sensors, and three new bands designed for exploration, adventure, and endurance 49mm aerospace-grade titanium case for an ideal balance of weight, strength, and corrosion resistance The largest, brightest Apple Watch display for improved legibility in all conditions Up to 36 hours of battery life for normal use along with low-power settings for even longer battery life Precision dual-frequency GPS system provides accurate location for calculating distance, pace, and route maps Water resistant 100m Greater operating temperature tolerances while on-wrist to accommodate incredibly diverse environments Customizable Action button can mark a Compass Waypoint, start Backtrack, mark segments in a workout, turn on the flashlight, and more Advanced safety features, including Siren, Backtrack, Fall Detection, Emergency SOS, and Crash Detection Improved Workout app with new metrics, new views, and advanced ways to train No Description