an insulative housing comprising an upper face and a lower face opposite to the upper face;

a plurality of signal contacts retained in the insulative housing;

a spacer positioned under the insulative housing and having a joint face engaging with the lower face and a mounting face opposite to the joint face; and

a retainer fastening the insulative housing and the spacer together, the retainer having a top wall affixing to the upper face of the insulative housing and a locking barb engaging with the mounting face of the spacer wherein the insulative housing and the spacer are configured to have a similar width, and wherein the insulative housing and the spacer each has a pair of side faces, the retainer having a pair of side walls affixing to the side faces, wherein the locking barb is extended inwardly from a lower end of the side wall, wherein the insulative housing comprises a mating face and an insert section projecting forwardly therefrom, the insert section presenting as cylinder shaped and defining a receiving cavity extending therethrough, wherein the insulative housing comprises a post extending downwardly from the lower face, the spacer defining a mating hole for receiving the post, wherein the insulative housing defines a plurality of passageways for receiving the signal contacts, wherein each signal contact has an end portion extending downwardly through the passageway and out of the lower face, wherein the spacer defines a plurality of receiving holes in alignment with the passageways respectively, and wherein the end portions are received in the receiving holes and further comprising a plurality of connection contacts received in the receiving holes for mechanically and electrically engaging with the end portions of the signal contacts, each connection contact having a soldering portion extending out of the mounting face.