An electrical connector includes an insulative housing defining a vertical mating direction, a plurality of contacts secured to the insulative housing, and a metallic shield secured to the insulative housing and surrounding the plurality of contacts, wherein the metallic shield and the plurality of contacts are insert-molded with the insulative housing, and the metallic shield has a pair of substantially vertical side walls, a pair of substantially vertical end walls respectively connected between the pair of side walls, and a pair of bottom walls connected between the pair of side walls.