Lenovo B540P Manuel D’Utilisation

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User Guide
Computer stand
Use the stand to position the display to your preference. It can be rotated between 
15º and 40º from the vertical. 
  Attention: 
1.  The computer stand must remain installed at all times to ensure 
maximum system stability.
2.  Make sure the angle of the computer is at least 15 degrees from the 
vertical; otherwise the computer will be unstable and could fall over.