1. 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. <br/> 2. The ECG app and irregular rhythm notification require the latest version 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 (not including Apple Watch SE). The irregular rhythm notification is not designed for people who have been previously diagnosed with AF. <br/> 3. Apple Watch Series 6, Apple Watch SE and Apple Watch Series 3 have a water resistance rating of 50 metres under ISO standard 22810:2010. This means that they may be used for shallow-water activities like swimming in a pool or ocean. However, they should not be used for scuba diving, waterskiing or other activities involving high-velocity water or submersion below shallow depth. <br/> 4. The international emergency calling feature requires an Apple Watch Series 6 (GPS + Cellular) or Apple Watch SE (GPS + Cellular) model. For a list of supported countries and regions, see apple.com/watchos/feature-availability. <br/> 5. Apple Watch Series 6 (GPS + Cellular) and Apple Watch SE (GPS + Cellular) can use a cellular connection for Emergency SOS. To use Emergency SOS on an Apple Watch without cellular connectivity, 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. <br/> 6. Wireless service plan required for cellular service. <br/> 7. All-day battery life is based on 18 hours with the following use: 90 time checks, 90 notifications, 45 minutes of app use, and a 60-minute workout with music playback from Apple Watch via Bluetooth, over the course of 18 hours. Apple Watch Series 6 (GPS) usage includes connection to iPhone via Bluetooth during the entire 18-hour test. Apple Watch Series 6 (GPS + Cellular) usage includes a total of 4 hours of 4G LTE connection and 14 hours of connection to iPhone via Bluetooth over the course of 18 hours. Testing conducted by Apple in August 2020 using pre-production Apple Watch Series 6 (GPS) and Apple Watch Series 6 (GPS + Cellular), each paired with an iPhone; all devices tested with pre-release software. Battery life varies by use, configuration, mobile network, signal strength and many other factors; actual results will vary.