49mm titanium case size
LTPO2 OLED Always‑On Retina display
Up to 3000 nits
ECG app Footnote
High and low heart rate notifications Footnote
Irregular rhythm notifications Footnote
Low cardio fitness notifications
Sleep Tracking
Sleep apnea notifications Footnote
Vitals app featuring heart rate, respiratory rate, wrist temperature, and sleep duration Footnote
Temperature sensing Footnote
Cycle Tracking with retrospective ovulation estimates Footnote
Emergency SOS Footnote
International emergency calling Footnote
Fall Detection and Crash Detection Footnote
Siren
Water resistant Footnote
Swimproof Footnote
Depth gauge to 40m
Water temperature sensor
High-speed water sports
Recreational scuba to 40m
Precision dual‑frequency GPS
Cellular connectivity Footnote
S9 SiP
Double tap gesture
Faster on-device Siri with health data access Footnote
Precision Finding for iPhone Footnote
Up to 36 hours normal use Footnote
Up to 72 hours in Low Power Mode Footnote
Fast charging (0–80% in about 1 hour) Footnote