See also:

Activating/deactivating ATTENTION ASSIST
This function is not available in HYBRID vehicles. Press the or button on the steering wheel to select the DriveAssist menu. Press the or button to select Attention Assist. Press . ...

Emergency Tensioning Devices, belt force limiters
The front seat belts and the outer seat belts in the rear are equipped with ETDs and seat belt force limiters. The ETDs tighten the seat belts in an accident, pulling them close against the body. ...

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. ...