1. A system for releaseably connecting a first device housing with a second device housing, comprising:at least three connection units,
wherein each of the connection units comprises a headed bolt and a corresponding keyhole-shaped recess configured for receiving the headed bolt in such a manner that the headed bolt can be inserted into the recess in a first section and held in the recess in a second section,
wherein at least one of the connection units comprises a locking mechanism configured for locking the bolt in the second section of the recess, and
wherein the locking mechanism comprises a movable locking element which is movable with respect to the headed bolt and configured to hold the headed bolt in the second section of the recess in a locking position;
wherein the locking mechanism comprises a locking catch configured to catch the headed bolt in the second section of the recess.