The radar sensor system includes a radar module, a plurality of antenna units, and a signal carrier. In accordance with the present invention, the interest generating, foldable display system of the present invention is quickly and easily automatically erected from its flat, generally two-dimensional configuration into a three-dimensional display. Compared to conventional systems, the valve can react very rapidly to disturbances in the preparation of the reformate and can especially prevent that disturbances lead to damage of the fuel cell unit and the electrical output power of the fuel cell unit continues to be controllable. Once programmed, the universal card emulates a function of a traditional card.