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The Apple Watch Series 8 features the beloved design of the Apple Watch, including a large, Always-On Retina display and a strong crack-resistant front crystal. With all-day 18-hour battery life, the Watch Series 8 builds on best-in-class health and safety features like the ECG app and fall detection by introducing temperature-sensing capabilities, retrospective ovulation estimates, Crash Detection, and international roaming. The Watch Series 8 is powered by watchOS 9, introducing new and more customizable watch faces like Lunar and Metropolitan, an enhanced Workout app, sleep stages, a first-of-its-kind AFib History feature, and an all-new Medications app.