An electrical connector (100, 200) includes an insulative body (10, 50), a shell (20, 60), a number of first contacts (30, 70) and second contacts (40, 80). The insulative body includes a seat (12, 52) and a mating plate (18, 58) projecting outwardly from the seat, which has opposite first and second sides. The mating plate has a first mating section (184, 186) and a second mating section (186, 586) behind the first mating section. The second mating section is thicker than the first mating section. The shell surrounds the seat and the mating plate and defines an opening at a front end thereof. Each first and second contact includes a contact ends (32, 72, 42, 82) arranged on the first mating section and the second mating section, respectively. The contact ends of the first and second contacts are located on the same side of the mating plate.