An electrical connector (100) includes an insulative housing (1), a set of contacts (2) retained in the insulative housing and a metal shell (3) covering the insulative housing. The insulative housing includes a base (11) and a tongue plate (12) protruding upwardly. The contacts have contacting portions (21) arranged in one row, retaining portions (22) extending from lower ends of the contacting portions and retained in the base, and tail portions (23) bending forwardly from lower ends of the retaining portions for being mounted directly onto a surface of the printed circuit board. The metal shell includes a front wall (31), a back wall (32) opposite to the front wall, and a pair of side walls (33) connecting the front and back walls. The front wall has a depressed wall (310) depressed backwardly and forming a hollow space for the tail portions (23) forwardly extending into.