The Apple Watch Series 6 features a number of new and improved features, including: A faster and more powerful processor. A new blood oxygen sensor, which allows you to measure your blood oxygen level with the watch. An always-on display, which allows you to see your watch face and important information without having to raise your wrist. A new ECG app, which allows you to take an electrocardiogram (ECG) from your wrist. Improved water resistance, allowing you to swim and take showers with the watch. A new and improved heart rate sensor, which provides more accurate heart rate tracking. A new and improved sleep tracking feature, which allows you to track your sleep patterns and quality. A new and improved fitness tracker, which allows you to track your workout progress and goals. A new and improved Siri, which allows you to control your watch with your voice. A new and improved battery life, which allows you to use your watch for longer periods of time without needing to charge it.