Apple Watch Series 6 lets you measure your blood oxygen level with a revolutionary new sensor and app.~ Take an ECG from your wrist.~ See your fitness metrics on the enhanced Always-On Retina display, now 2.5x brighter outdoors when your wrist is down. Set a bedtime routine and track your sleep. And reply to calls and messages right from your wrist. It~s the ultimate device for a healthier, more active, more connected life.