44mm368 by 448 pixels 977 sq mm display area; 40mm 324 by 394 pixels The ECG app is available on Apple Watch Series 4 or later (not including Apple Watch SE). The irregular rhythm notification is not designed for people who have been previously diagnosed with Afib. Not all features will be available if the Apple Watch is set up
Watch6 comes with blood oxygen tracking and an Apple S6 chip out of the box in a premium design. Apple Watch Series 6 (44mm) (Cellular) Specifications,
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