Apple Watch Ultra Features

49mm Titanium case and flat sapphire front
Always-On Retina displays up to 2,000 nits
A customizable Action button
Battery life: 36 hours during normal use; up to 60 hours on low power mode
3 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
Certifications: EN13319, WR100, MIL-STD 810
watchOS 9