An electrical connector includes a first insulative housing having a first mating port and a second mating port arranged side by side, a plurality of first contacts retained to the first mating port, and a plurality of second contacts retained to the second mating port. The first mating port includes first and second mating tongues providing corresponding first and second mating faces opposite to each other. The second mating port defines a first strengthen arm adjacent to the first mating port to connect with the first and second mating tongues, the first contacts provide first contacting portions exposed upon both the first mating face and the second mating face.