See also:

Lumbar support
The curvature of the seat backrest can be adjusted in such a way that it supports the lumbar region of the spine. The lower back and the spine are supported for upright posture. ► Press the ...

Removing the mobile phone
  Press the button and remove the mobile phone. ...

Displaying overview
1. Select the subdirectory if necessary. 2. Select "Overview". Select "Overview" 3. Press the button. It may take some time until the overview is completely displayed. ...