passageway referring to fig8 and 9 the metal shield 70 is directly formed by stamping a metal sheet and includes a first shielding portion 710 a second shielding portion 720 and a connection 730 interconnecting the first and second shielding portions 710 and 720 the first and second shielding portions 710 and 720 each abut onto the upper and lower surfaces of the mating portion 540 in the preferred embodiment of the present invention the first and second shielding portions 710 and 720 are smoothly covering the upper and lower surfaces of the mating portion 540 while the connection 730 is arranged on both sides of the front end portion of the mating portion 540 the thickness of the platform 543 is equal to the mating portion 540 accordingly the first and second shielding portions 710 and 720 cover the platform 543 the first shielding portion 710 is also defined with guiding slot 711 which extends into the platform 543 of the mating portion 540 for receiving the mating connector 200 see fig1 for details accordingly the connectors can be smoothly and correctly engaged the second shielding portion 720 is provided with locking arm 721 bent upwardly a latch 722 is formed on the front of the locking arm 721 so as to securely interlock the connectors after mating the upper and lower surfaces.