A receptacle connector includes an insulative housing defining a base and a mating tongue extending with a step portion defined at a root region of the mating tongue; a plurality of contacts disposed in the insulative housing with contacting sections exposed upon a first surface and a second surface of the mating tongue and categorized with signal contacts, power contacts and grounding contacts; a shielding plate embedded with the mating tongue and forming a pair of locking edge in two opposite lateral side edges; and an EMI collar intimately surrounding the step portion, the collar comprising two long portions covering the first surface and the second surface of the step portion and two short portions connecting with opposite ends of the long portions. A lateral rigid finger extends straight from a side of the shielding plate and touch an inner side of a short portion of the collar.