Electrical connector having an outer shell and an insulative housing side wall to define an engaging groove and a pair of side grooves

1. An electrical connector comprising:

an insulative housing having a mating slot;

a contact module received in the insulative housing; and

a metallic outer shell enclosing the insulative housing and having a latching portion spaced apart from a side wall of the insulative housing; wherein

the metallic outer shell includes a pair of bulging portions flanking the latching portion to define, together with the side wall of the insulative housing, an engaging groove; and

the metallic outer shell includes a pair of end walls and a pair of side portions between the end walls and the bulging portions, respectively, to define, together with the side wall of the insulative housing, a pair of side grooves.

2. The electrical connector as claimed in claim 1 , wherein the insulative housing has a pair of notches exposed to the pair of side grooves, respectively.

3. The electrical connector as claimed in claim 1 , wherein the insulative housing has a first lug securing the latching portion and a pair of second lugs securing the pair of bulging portions.

4. The electrical connector as claimed in claim 1 , wherein the bulging portion is substantially U-shaped and abuts against the side wall of the insulative housing.

5. The electrical connector as claimed in claim 1 , wherein the insulative housing has an opposite side wall, and a thickness of said side wall is less than a thickness of the opposite side wall.