An electrical connector assembly (100) including: a housing (1) having an upper shield part (15) and a lower shield part (16) engaged with each other to form a rear body portion (12) and a front mating portion (13). Two printed circuit boards (2) are positioned in the housing. A spacer (3) is sandwiched between the two printed circuit boards. A metallic holder (8) surrounds the body portion of the housing. A metallic gasket (9) surrounds a rear section of the mating portion and located adjacent to the body portion. Each of the upper and lower shield parts has a first post positioning (154, 162) a corresponding one of the two printed circuit boards and a second post positioning (155, 163) the two printed circuit boards and the spacer.