Marder defence - control arrangement is adapted, characterized in that a defense apparatus at its electrical supply voltage input with a digital voltmeter (dvm) is galvanically connected, and in that the indication of this volt meter can be arranged in the housing itself, and in such a way that the displays - surface of the volt meter to the outside of the housing has in this case, and is congruent with the housing - surface is located, and that a film material is arranged by means of two continuous, and in that below this foil material in the apparatus of any desired type of sensor and is coupled with a switching unit, and in that the switching output of this sensor both the function of the switching unit is arranged in the device type voltmeter - module and / or also simultaneously or in a time sequence, the frequency - switching of the contained in the apparatus is influenced by the signal generator.
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