49mm
titanium case
Always-On Retina display
Up to 3000 nits
S9 SiP
Double tap gesture
Faster on-device Siri with health data access
Precision Finding for iPhone
ECG app
High and low heart rate notifications
Irregular rhythm notifications
Low cardio fitness notifications
Sleep apnea notifications
Up to 36 hours
Up to 72 hours in Low Power Mode
Fast charging