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.