Apple Watch Series 11, a thin, lightweight smartwatch for health, fitness and safety. - **Health:** ECG, alerts for high or low heart rate and irregular rhythm, possible hypertension and sleep apnoea notifications, Vitals app. - **Sleep score:** a daily score to understand and improve your sleep. - **Fitness:** heart rate zones, training load, Pacer and Workout Buddy (with a nearby iPhone). - **Safety:** fall and car crash detection that calls emergency services. Check In tells a loved one you've arrived. - **Battery:** up to 24 hours. A 15-minute fast charge gives up to 8 hours. - **Durable:** glass 2× more scratch-resistant than Series 10, water-resistant to 50 m (good for swimming), IP6X dust-resistant. - **Cellular models:** calls, texts, music and 5G without your iPhone. *Some features depend on the model, region and a compatible iPhone.*