45mm or 41mm case size

50m water resistant footnote

Swim proof footnote

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 notification footnote

Cardio fitness notifications

Temperature sensing

Cycle Tracking with retrospective ovulation estimates

Emergency SOS footnote

International emergency calling footnote

Fall Detection

Crash Detection footnote

High-g accelerometer

Cellular available footnote

Supports Family Setup footnote
Connect family members who don’t have an iPhone