Always-On Retina display Up to 1,000 nits brightness.
Certified IP6X dust resistant
50 m water resistant.
Swimproof.
Blood Oxygen app.
ECG app.
High and low heart rate notifications.
Irregular rhythm notification.
Cardio fitness notifications.
Emergency SOS.
International Emergency Calling.
Fall Detection.
Crash Detection.
High-g accelerometer.

In The Box: Apple Watch, Band, and USB-C charging cable.