For an electric hermaphroditic plug-in connector a hermaphroditic contact with a plug-in area and a terminal area is proposed that consists of a solid, single-piece contact part, the plug-in area being formed as an adjacent sleeve and pin contact and a separate, elastic contact element being provided in the sleeve contact. The power cable-holding portions couple with one or more cables. Suitably, the reactants are provided such that the molar ratio of activated diaryl carbonate to the total of dihydroxy compound plus \xbd the chainstopping reagent that is less than 1. Moreover the controller detects an electrical wave from a nearby vehicle at the transmission timing.