Apple Watch Series 9 helps you stay connected, active, healthy, and safe. Featuring double tap, a magical way to interact with Apple Watch, an even-brighter display, faster on-device Siri, and Precision Finding for iPhone.Keep an eye on your blood oxygen.Take an ECG anytime. Get notifications if you have an irregular heart rhythm.? See how much time you spent in REM, Core, or Deep sleep with sleep stages. Temperature sensing provides insights into overall well-being and cycle tracking. And take note of your state of mind to help build emotional awareness and resilience.