a receptacle connector includes an insulative housing defining a base and a mating tongue , with a widen and thicken step structure around a root thereof adjacent to the base ; two rows of contacts disposed in the insulating housing with contacting sections exposed upon the mating tongue and mount tails out of the base ; a metallic shield surrounding the mating tongue so as to define a mating cavity ; and a metallic bracket attached the shield . the first wall of the shield defines a pair of spring tangs split therefrom and extending rearwards into the mating cavity , the second wall defines a pair of dimples protruding inwards the mating cavity for holding the plug connector . the bracket covers spring tangs and seals any opens defined on the first wall for keeping integrity therewith under emi consideration .