Always-on Retina display has nearly 20% more screen area than Series 6, making everything easier to see and use than ever before. The most crack-resistant front crystal yet on an Apple Watch, IP6X dust resistance, and swim proof design just to name a few awesome features. Take an ECG anytime, anywhere - Get high and low heart rate, and irregular heart rhythm notifications - Measure your blood oxygen with a powerful sensor and app. Track your daily activity on Apple Watch, and see your trends in the Fitness app - Stay in the moment with the new Mindfulness app, and reach your sleep goals with the Sleep app. Track new tai chi and Pilates workouts, in addition to favorites like running, yoga, swimming, and dance - Sync your favorite music, podcasts, and audiobooks - Pay instantly and securely from your wrist with Apple Pay.