The invention relates to a tensioning system for a mobile telescopic crane, in which the telescopic mast is outwardly braced via a tensioning means, and wherein said tensioning means is guided along or over the telescopic mast and fastened to the telescopic mast in such a way that a pressure bias of the mast is created in the area of the tensioning means guide. The packaging is at least partially substantially rigidly formed and the at least one attachment element inserted in the at least one mounting is maintained in a position in a positive-locking manner, in which it does not project over the bottom surface of the component. While resting in the docking station the computer tablet may be rotated to various angles and still maintain electrical connectivity to the docking station. The outer shell 12 is comprised of a thin plate having an undulating cross-sectional shape formed by plastic forming.