45mm or 41mm case size
50m water resistantfootnote⁵
Swimprooffootnote⁵
Certified IP6X dust resistant
Always-On Retina display
Up to 1000 nits brightness
Blood Oxygen app
ECG app
High and low heart rate notifications
Irregular rhythm notificationfootnote⁸
Cardio fitness notifications
Temperature sensing
Cycle Tracking with retrospective ovulation estimates
Emergency SOSfootnote⁹
International emergency callingfootnote¹⁰
Fall Detection
Crash Detectionfootnote⁹
High-g accelerometer
Cellular availablefootnote¹¹
Supports Family Setupfootnote¹²
Connect family members who don’t have an iPhone