An electrical connector includes an insulating housing defining a pair of pivotal grooves on two opposite sides of a front end thereof and a L-shaped recess at each side thereof. A plurality of contacts are arranged in the housing. A metal shell defines a pair of pivotal posts sliding assembled in the pivotal grooves, the metal shell rotating downward to cover on the insulating housing. The shell defines a locking element extending to the front end of the housing and inserted in the L-shaped recess to lock the metal shell with the insulating housing.