See also:

Deactivating HDC
Press the button again and the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...

Maintaining/storing the speed
Press the button*. When the system is switched on, the current speed is maintained and stored as the desired speed. It is displayed in the speedometer and briefly displayed in the instrument ...

The concept
Personal Profile concept You can set several of your vehicle's functions to suit your personal needs and preferences. The settings are automatically saved in the profile currently activated. ...