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.Blood Oxygen app measurements are not intended for medical use, including self-diagnosis or consultation with a doctor, and are only designed for general fitness and wellness purposes. The ECG app and irregular rhythm notification require the latest versions of watchOS and iOS and are not intended for use by people under 22 years old. The ECG app is available on Apple Watch Series 4 or later. The irregular rhythm notification is not designed for people who have been previously diagnosed with atrial fibrillation (AFib).Wireless service plan required for cellular service. Contact your service provider for more details. International roaming is not supported. Check apple.com/watch/cellular for participating wireless carriers and eligibility. See support.apple.com/en-us/HT207578 for additional setup instructions.