A plug connector mateable with the receptacle connector, includes an insulative housing enclosed in a metallic shell, defining a receiving cavity to receive the mating tongue, and equipped with a plurality of contacts on opposite sides. A pair of mounting ears are located on two opposite lateral ends of the housing in a transverse direction. A securing/shield plates forms a pair of locking heads extending into two opposite lateral sides of the receiving cavity to lock with a shielding plate embedded within a mating tongue of the complementary receptacle connector during mating. A metallic EMI shield encloses the metallic shell and includes a front wall with there in a front opening through which the metallic shell with the housing forwardly extends and a pair of side walls with therein a pair of slots through which the mounting ears laterally extend outwardly away from each other in the transverse direction.