Apple Watch Series 6 is a powerful device that takes care of you. This watch has a new sensor and a special app for measuring blood oxygen levels. And many other advanced features for a healthy lifestyle. The always-on Retina display is now 2.5 times brighter outdoors when the hand with the watch is down. Track your physical activity on Apple Watch and check trends in the Fitness app on iPhone. Notifications about too low and high heart rate.