Apple Watch Series 6 lets you measure your blood oxygen level with a revolutionary new sensor and app.1 Take an ECG from your wrist.2 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. Apple Watch Series 6 requires an iPhone 6s or later with iOS 14 or later. 1Blood 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. 2The 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). 3ISO standard 22810:2010. Appropriate for shallow-water activities like swimming. Submersion below shallow depth and high-velocity water activities not recommended. 4To use Emergency SOS, your iPhone needs to be nearby. If your iPhone isn't nearby, your Apple Watch needs to be connected to a known Wi-Fi network and you must set up Wi-Fi Calling.