See Your Sleep Result—The Sleep Result feature provides an easy way to help you track, understand, and learn how to improve your sleep quality. Receive notifications in case of high or low heart rate, system disorder, and potential sleep apnea. View your nocturnal health data in biomarker app and oxygen level readings | Design and no cooler — With its slim and lightweight design, Series 11 is convenient around the clock, during exercise and even while you sleep, to help you track your most important health metrics | Your powerful fitness partner – with advanced measurements for all your workouts and features like pacemaker, heart rate zones, training load feature and more. *Series 11 also comes with a free three-month subscription to +Apple Fitness | Big leap in battery life — with up to 24 hours of battery life from normal use. Fast charge up to 8 hours of normal use in just 15 minutes | Durable design with you — with an ultra-durable glass display, 2x stronger than Series 10 in scratch resistance. The Series 11 is also waterproof to a depth of 50 metres and dust resistant to IP6X | Safety Features — The Series 11 can detect your exposure to a heavy fall or a serious car accident, and can automatically help you contact emergency services and notify the people you have designated as emergency contacts. The reassurance feature can automatically send a notification to a loved one that alerts them to your destination | Stay connected — you can send messages, answer calls, listen to music, use Siri, and get notifications. Series 11 (GPS model) works with iPhone or Wi-Fi to keep you connected.