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 with cellular service, you can go without your phone. it’s the ultimate device for a healthier, more active, more connected life.