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. ...

Safety switch for the rear
Press the button on the driver's door if children are being transported in the rear. This locks the rear window switches so that the windows cannot be operated from the rear: safety switch. ...

Switching off automatically
The system switches off and the LED goes out: After approx. 33 ft/10 m when driving forward. Above approx. 9 mph/15 km/h when driving forward. Switch on the system again if necessary. ...