Apple Watch Ultra features 36 hours battery of life during normal use; up to 60 hours battery life on low power mode watchOS 9 49mm titanium case and flat sapphire front Always-On Retina displays up to 2,000 nits A customizable Action button Three new bands: Trail Loop, Alpine Loop, and Ocean Band Precision dual-frequency GPS, LTE Night mode, Compass, Pro running features, Depth gauge, Crash Detection ECG, Temperature sensing, Blood Oxygen Swimproof (100m), IP6X dust resistant