An electrical connector (100) for mounting on an external printed circuit board comprises an insulative housing (20) having a front mating face, a mounting face, a plurality of passageways (216) extending rearwardly from the mating face, a receiving cavity (213) extending through the mounting face and communicating with the passageways; an inner module (30) received in the receiving cavity and including a front contact module (31) having a front insulative block (313) and a plurality of front contacts (301) mounted thereon and extending into corresponding passageways, a rear contact module (32) having a rear insulative block (323) and a plurality of rear contacts (302) mounted thereon and extending beyond the mounting face for being mounted on the external printed board, and an inner printed circuit board (304) sandwiched between the front insulative block and the rear insulative block and electrically connecting the front contacts with the rear contacts.