Plug for electrically mating with a receptacle

A plug for electrically mating with a receptacle, comprising:

• a plurality of top contacts embedded in a top insulator, wherein each of the plurality of top contacts has a top cantilever and a top leg respectively protruding forward and backward from the top insulator;
• a shielding sheet, from both sides of which two retention latches respectively extend;
• a plurality of bottom contacts embedded in a bottom insulator, wherein each of the plurality of bottom contacts has a bottom cantilever and a bottom leg respectively protruding forward and backward from the bottom insulator;
• a front insulator configured to receive every top cantilever and every bottom cantilever and provided with a front opening for the receptacle to be correspondingly inserted in,
• two ground pieces respectively disposed on a top niche and a bottom niche of the front insulator, wherein the top insulator, the bottom insulator and the front insulator are coupled together while the shielding sheet is wedged between the top insulator and the bottom insulator;
• and
• a front conductive shell including a base and a sheath, the base protruding outward to form a shoulder between the base and the sheath, the sheath substantially fitting closely around the front insulator, the two ground pieces electrically connected to the sheath, wherein the front insulator has a front edge concaved backward while the sheath has a front edge convexed backward and forming a continuously closed loop around the front opening in order to engage with and fully cover the front edge of the front insulator such that the front edge of the sheath is seamless around the front opening.