Electrical connector having improved shell

An electrical connector for being mounted on a printed circuit board (PCB), comprising:

• an insulative housing comprising a front wall, a top wall, a bottom wall and opposed sidewalls which together define a first and a second interior spaces without communicating with each other;
• a first set of conductive terminals respectively received in the first interior space;
• a second set of conductive terminals respectively received in the second interior space;
• and
• a shell enclosing the housing and comprising two retention devices on each of two opposite sides thereof, each retention device including a hook and a beam extending through the housing, the hook being longer than the beam and having a bottom free end forming a protrusion at a side edge thereof, the protrusion being adapted for engaging in a hole in the PCB;
• wherein
• the protrusion of the hook comprises first and second barb portions;
• wherein
• the housing comprises a pair of opposite step portions projecting outwardly from opposed sidewalls thereof, each of said step portions defining two pairs of retaining holes and apertures;
• wherein
• the hook and the beam respectively extend through the retaining hole and the aperture of the corresponding step portion of the housing.