Apple 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. Features With cellular, stay connected even without your iPhone nearby Stream or sync your favorite music, podcasts, and audiobooks Set up and manage an Apple Watch for each family member, right from your iPhone, with Family Setup Temperature sensor provides retrospective ovulation estimates and advanced cycle tracking features Measure your blood oxygen with a powerful sensor and app Take an ECG anytime, anywhere Get high and low heart rate, and irregular rhythm notifications Advanced safety features, including Fall Detection, Emergency SOS, and Crash Detection Enhanced Workout app with more advanced metrics and ways to train A completely redesigned Compass app with waypoints and Backtrack Track your daily activity on Apple Watch, and see your trends in the Fitness app on iPhone The most crack-resistant front crystal yet on an Apple Watch, IP6X dust resistance and swimproof design, and increased durability for fitness and activity Call, text, and email with just a few taps Make purchases instantly and securely from your wrist with Apple Pay Large, Always-On, edge-to-edge display All-day battery life and fast charging Sleep stages tracking lets you see how much time you spend in REM, core, and deep sleep watchOS 9 features an enhanced Workout app, a new Medications app, sleep stages, and greater insights into heart health Apple Watch comes with 3 free months of Apple Fitness+, featuring 11 different workout types, from HIIT to Yoga, and even meditations Apple Watch Series 8 requires an iPhone 8 or later with iOS 16 or later. The 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. 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 temperature sensing feature is not a medical device and is not intended for use in medical diagnosis, treatment, or for any other medical purpose. The 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. Emergency SOS requires a cellular connection or Wi-Fi Calling with an internet connection from your Apple Watch or nearby iPhone. . Apple .