GPS model lets you take calls and reply to texts from your wrist Always-on Retina display has nearly 20% more screen area than Series 6, making everything easier to see and use The most crack-resistant front crystal yet on an Apple Watch, IP6X dust resistance, and swimproof design Measure your blood oxygen with a powerful sensor and app Take an ECG anytime, anywhere Get high and low heart rate, and irregular heart rhythm notifications Description The largest, most advanced Always-on Retina display yet makes everything you do with your Apple Watch Series 7 bigger and better. Series 7 is the most durable Apple Watch ever built, with an even more crack-resistant front crystal. Advanced features let you measure your blood oxygen level, take an ECG anytime, and access mindfulness and sleep tracking apps. You can also track dozens of workouts, including new tai chi and pilates.