PRODUCT OVERVIEW Apple 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 FEATURES 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 Listen to your favorite music, podcasts, and audiobooks (for use with GPS models) 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