OVERVIEWApple Watch Series 8 features advanced health sensors and apps, so you can take an ECG, measure heart rate and blood oxygen, and track temperature changes for advanced insights into your menstrual cycle. And with Crash Detection, sleep stages tracking, and advanced workout metrics, it helps you stay active, healthy, safe, and connected. See Dimension section below for band sizing information.FEATURESTemperature sensor provides retrospective ovulation estimates and advanced cycle tracking featuresMeasure your blood oxygen with a powerful sensor and appTake an ECG anytime, anywhereGet high and low heart rate, and irregular rhythm notificationsAdvanced safety features, including Fall Detection, Emergency SOS, and Crash DetectionEnhanced Workout app with more advanced metrics and ways to trainA completely redesigned Compass app with waypoints and BacktrackTrack your daily activity on Apple Watch, and see your trends in the Fitness app on iPhoneThe most crack-resistant front crystal yet on an Apple Watch, IP6X dust resistance and swimproof design, and increased durability for fitness and activityCall, text, and email with just a few tapsListen to your favorite music, podcasts, and audiobooks (for use with GPS models)Make purchases instantly and securely from your wrist with Apple PayLarge, Always-On, edge-to-edge displayAll-day battery life and fast charging