1. Apple Watch Series 6, Apple Watch SE and Apple Watch Series 3 have a water resistance rating of 50 meters 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.
2. Irregular rhythm notification requires Apple Watch Series 3 or later (not including Apple Watch SE) with watchOS 6 or later and iPhone 6s or later with the latest version of iOS. It is not intended for use by people under 22 years old or those who have been previously diagnosed with atrial fibrillation (AFib). See apple.com/watch for compatibility details.
3. To use Emergency SOS, your phone 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.