Measure your blood oxygen with a revolutionary new sensor. Take an electrocardiogram from your wrist anytime, anywhere. Meet your sleep goals each night so you can live a healthier day. 

Track your daily activity and precisely measure all your favorite ways to work out, even underwater. 

The Always-On Retina display is now 2.5x brighter outdoors when your wrist is down, so you can see your watch face without waking your screen. And with new customizable faces, there’s a look for you.