44mm or 40mm case size
50m water resistantfootnote⁵
Swimprooffootnote⁵
Retina display
Up to 1000 nits brightness
High and low heart rate notifications
Irregular rhythm notificationfootnote⁸
Cardio fitness notifications
Cycle Tracking
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