An electric connector includes an insulating socket, a plurality of first socket terminals, a plurality of second socket terminals, a plurality of third socket terminals, a plurality of fourth socket terminals, a plurality of fifth socket terminals, and a mechanical moving member. The mechanical moving member is disposed between a first position and a second position of an insulating base. When the mechanical moving member is positioned at the first position, part of the third socket terminals are connected to the fifth socket terminals, the second socket terminals and the third socket terminals transmit a second signal meeting a second standard. When the mechanical moving member is positioned at the second position, part of the third socket terminals are connected to the fourth socket terminals, the first socket terminals and part of the third socket terminals transmit a third signal meeting a third standard.