• 40mm Retina display with improved brightness• S9 SiP with faster performance and efficiency• Enhanced health features including temperature sensing• Advanced Crash Detection with improved algorithms• Water resistant 50 meters for water activities• GPS and cellular options available• Comprehensive fitness tracking capabilities• Improved sleep tracking with more metrics• Up to 20 hours of battery life• Aluminum case with new color options• Double tap gesture for hands-free control• watchOS with new health and fitness features
