An electrical connector includes an insulative housing defining a mating cavity, a tongue portion forwards extending into the mating cavity and defining thereon first and second faces opposite to each other, and first and second sets of contacts retained to the housing. The first set of contacts includes pairs of differential pairs and grounding contacts arranged at opposite sides of the differential pairs, and each of the differential pairs defines a first contacting section disposed in the first face and a soldering section. The second set of contacts each defines a deflectable cantilevered beam accessible from the second face. At least one of the grounding contacts defines a main section retained in the tongue portion and further extending into the mating cavity along the tongue portion, and the main section is disposed in a plane perpendicular to the first face.