1. Apple Watch Series 4 has a water resistance rating of 50 meters under ISO standard 22810:2010. This means that it may be used for shallow-water activities like swimming in a pool or ocean. However, Apple Watch Series 4 should not be used for scuba diving, waterskiing, or other activities involving high-velocity water or submersion below shallow depth.
2. 1GB = 1 billion bytes; actual formatted capacity less.
3. The ECG app requires watchOS 5.1.2 or later and iOS 12.1.1 or later, and is not intended for use by people under 22 years old.
4. Apple Watch All-Day Battery Life testing was conducted by Apple in August 2018 using preproduction Apple Watch Series 4 (GPS) and Apple Watch Series 4 (GPS + Cellular), each paired with an iPhone; all devices were tested with prerelease software. Battery life varies by use, cellular coverage, configuration, and many other factors; actual results will vary. See www.apple.com/batteries and www.apple.com/watch/battery.html for more information
Features are subject to change. Some features, applications, and services may not be available in all regions or all languages. Visit https://www.apple.com/watchos/feature-availability/ to see complete list.
To learn more about wearing Apple Watch, getting a good fit, potential skin sensitivity, and proper care and cleaning, Visit https://support.apple.com/HT204665 for more details.
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