an insulating portion, the insulating portion defining a receiving space and a mating space in communication with the receiving space, the mating space extending through the insulating portion so as to form a mating port;

a receptacle terminal module, the receptacle terminal module being mounted to the insulating portion, the receptacle terminal module comprising a first terminal module and a second terminal module, the first terminal module and the second terminal module having a same structure and being symmetrically arranged on opposite sides of the mating space along a first direction;

a metal shell, the metal shell enclosing the insulating portion;

a receptacle circuit board, the first terminal module and the second terminal module being electrically connected to the receptacle circuit board; and

an adapter module electrically connected to the receptacle circuit board, the adapter module comprising an adapter body and a plurality of output terminals fixed to the adapter body; wherein one end of each output terminal is electrically connected to the receptacle circuit board, and another end of each output terminal extends downwardly beyond the adapter body.