The concept
The parking brake is primarily intended to prevent the vehicle from rolling while parked; it brakes the rear wheels.

See also:
Collision warning
The concep
The system issues a two-phase warning of a
danger of collision at speeds above approx.
10 mph/15 km/h. The time of these warnings
may vary depending on the current driving situation.
...
Vehicle equipment
All standard, country-specific and optional
equipment that is offered in the model series is
described in this chapter. Therefore, equipment
is also described that is not available in a vehicle,
e ...
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"
...
