45mm or 41mm case size

50m water resistantfootnote

Swimprooffootnote

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 notificationfootnote

Cardio fitness notifications

Temperature sensing

Cycle Tracking with retrospective ovulation estimates

Emergency SOSfootnote

International emergency callingfootnote

Fall Detection

Crash Detectionfootnote

High-g accelerometer

Cellular availablefootnote

Supports Family Setupfootnote

Connect family members who don’t have an iPhone