See also:

Resuming cruising speed
Press button 4: The stored speed is resumed and maintained ...

Adjusting the volume
Turn the knob until the desired volume is selected. The setting is stored for the remote control currently in use. The vehicle automatically adjusts the volume of the microphone on the telephone ...

Switching off automatically
The system switches off and the LED goes out: After approx. 160 ft/50 m when driving forward. Above approx. 22 mph/36 km/h when driving forward. Switch on the system again if necessary. ...