PRODUCT OVERVIEWApple Watch Series 8 features advanced health sensors and apps, so you can take an ECG¹, measure heart rate¹ and blood oxygen², and track temperature changes³ for advanced insights into your menstrual cycle⁴. 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. KEY FEATURESTemperature sensor provides retrospective ovulation estimates and advanced cycle tracking features⁴Measure your blood oxygen with a powerful sensor and app²Take an ECG anytime, anywhere¹Get high and low heart rate, and irregular rhythm notifications¹Advanced safety features, including Fall Detection, Emergency SOS⁵, 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 Pay⁷Large, Always-On, edge-to-edge displayAll-day battery life and fast charging⁸Sleep stages tracking lets you see how much time you spend in REM, core, and deep sleepwatchOS 9 features an enhanced Workout app, a new Medications app, sleep stages, and greater insights into heart healthApple Watch comes with 3 free months of Apple Fitness+, featuring 11 different workout types, from HIIT to Yoga, and even meditations⁹¹Apple Watch Series 8 requires an iPhone 8 or later with iOS 16 or later.²The ECG app and irregular rhythm notification require the latest versions of watchOS and iOS and are not intended for use by people under 22 years old.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.³Blood 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.⁴The temperature sensing feature is not a medical device and is not intended for use in medical diagnosis, treatment, or for any other medical purpose.⁵The Cycle Tracking app should not be used as a form of birth control. Data from the Cycle Tracking app should not be used to diagnose a health condition.⁶Emergency SOS requires a cellular connection or Wi-Fi Calling with an internet connection from your Apple Watch or nearby iPhone.