See also:

Using the main loudspeakers
This function is available in conjunction with COMAND. You can use the vehicle loudspeakers to listen to a disc inserted in the rearcompartment drive. To do so, at least one of the rear-compa ...

Cleaning the steering wheel and gear or selector lever
  Thoroughly wipe with a damp cloth or use leather care agents that have been recommended and approved by Mercedes- Benz. ...

Storing and maintaining the current speed
You can store the current speed if you are driving faster than 20 mph (30 km/h). Accelerate the vehicle to the desired speed. Briefly press the cruise control lever up 1 or down 2. Remove ...