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 level¹, take an ECG at any time², and access mindfulness and sleep tracking apps. You can also track dozens of workouts, including new Tai Chi and Pilates.