Large screen. Huge difference. Series 7 with advanced features, you can measure the oxygen level in your blood,1 take an EKG anytime2 and enjoy apps for mindfulness and sleep tracking. There are also countless trainings you can follow, e.g. the new tai-chi and pilates. Main characteristics · The always-on Retina display has an almost 20% larger screen area than the Series 6 · The most shock-resistant front glass on an Apple Watch ever · A dust-resistant (IP6X) and swim-proof design3 · Measure the oxygen level in your blood with a powerful sensor and app1 · Take an EKG anytime, anywhere2 · Get ​​notifications about high or low heart rate and irregular heartbeat4 · Be present in the moment with the new Mindfulness app, and get the hours you need with the Sleep app · Follow the new tai-chi and pilates training · Track your daily activity and exercise patterns on Apple Watch · Sync your favorite music, podcasts and audiobooks · Make instant and secure payments from your wrist with Apple Pay · Battery life for a whole day and faster charging