The smartphone has to be provided with a suitable COMPIT COVER before it can be securely mounted on the COMPIT or the +COM/UNIT. The smartphone cover with the special mounting device makes it possible to dock the smartphone onto the system by pushing it on and turning it over the oversize bayonet mounting. The shock absorbing materials that the cover is made of enclose the outer edges of the smartphone and protect it in the event of impact. The use of high quality and wear-resistant plastic makes the cover especially robust at the points of maximum stress. The 2-component cover that is pleasant to the touch can be easily attached to and removed from the smartphone.