APPLE BUSINESS ZONES
|Ultra 2||Series 9||Series 8|
|Case size||49mm||45mm or 41mm||45mm or 41mm|
|Case finish||Titanium||Aluminium, Stainless Steel||Aluminium, Stainless Steel|
|Retina display||Always on||Always on||Always on|
|High and low heart rate|
|Irregular heart rhythm|
|Blood Oxygen app|
|Chip||S9 SiP||S9 SiP||S8 SiP|
* Blood Oxygen app measurements are not intended for medical use, including self-diagnosis or consultation with a doctor, and are only designed for general fitness and wellness purposes.
** The ECG app is available on Apple Watch Series 4 and later (not including Apple Watch SE) with the latest versions of iOS and watchOS. See apple.com/watch for compatibility details. ECG is not intended for use by people under 22 years old. With the ECG app, Apple Watch is capable of generating an ECG similar to a single-lead electrocardiogram.