See also:

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 telephon ...

Opening the tone settings in the Options menu*
1. "CD/Multimedia" or "Radio" 2. If necessary, select additional entries, for example, "FM" or "CD/DVD". 3. Open "Options". 4. "Tone" ...

Remove attached parts following use
Remove auxiliary mirrors, roof or rear luggage racks which are no longer required following use. Attached parts on the vehicle impair the aerodynamics and increase the fuel consumption. ...