A cable assembly includes a PCB, a rear housing, a front housing assembled with the rear housing and a locking member. The printed circuit board includes a mating end formed with a plurality of first conductive pads and rear end formed with a plurality of second conductive pads. The rear housing is over molded around the rear end of the PCB. The front housing encloses a part of the PCB. The front housing defines a receiving slot and an engaging portion. The locking member is assembled to the engaging portion. The front housing further has two restricting portions extending upwardly from the upper surface thereof, each restricting portion has a supporting portion, an extension portion forwardly extending from a rear end of the supporting portion and spaced from the supporting portion so that a receiving groove is formed between the supporting portion and the extension portion.