On/Off button labels
Turn on button labels to see an additional position indicator. With labels on, you see a one (1) on any option that is on, and a zero (0) on options that are turned off.
Add labels to On/Off buttons. On Apple Watch, open the Settings app , go to General > Accessibility, then turn on On/Off Labels. You can also use iPhone to turn on labels for Apple Watch—open the Apple Watch app on iPhone, tap My Watch, go to General > Accessibility, then turn on On/Off Labels.