GoKawiilApple Watch Ultra 4's action button offers customizable one-touch shortcuts
The Apple Watch Ultra 4 includes an orange action button near the speaker grille that lets users trigger a single assigned command instantly, bypassing menus other Apple Watch models require. The button can also activate an emergency siren to help attract attention in dangerous situations, and it supports a range of assignable commands that pair with new automation features in watchOS 27 and iOS 27.