- LTPO2 OLED Always‑On Retina display
- Up to 3000 nits
- High and low heart rate notifications1
- Irregular rhythm notifications2
- Low cardio fitness notifications
- Sleep Tracking
Sleep apnea notifications3 - Vitals app featuring heart rate, respiratory rate, wrist temperature, and sleep duration4
- Temperature sensing Cycle Tracking with retrospective ovulation estimates6
- Emergency SOS7
International emergency calling8
Fall Detection and Crash Detection7, 9
Siren - Water resistant12
Swimproof12
Depth to gauge 40m
Water temperature sensor
High-speed water sports
Recreational scuba to 40m - dual‑frequency GPS
Cellular connectivity14 - S9 SiP
Double tap gesture
Faster on-device Siri with health data access15
Precision Finding for iPhone16 - Up to 36 hours normal use19
Up to 72 hours in Low Power Mode19
Fast charging (0–80% in about 1 hour)20