A limited number of Apple Watch units might not charge after entering Power Reserve mode. Power Reserve normally saves the last of the battery life remaining by shutting down all features except the time. Pressing the side button in Power Reserve displays the time and a red low battery icon. When the battery gets too low, the watch will automatically enter Power Reserve.

Apple's official Translate app for iOS makes translating and hearing pronunciations of words in different languages quick and easy. The app automatically saves every word and phrase that is entered. This history accumulates over time and can be used to view previous translations or favorite frequently used translations, for fast access later.