A flappable plug connector and a complementary receptacle connector are provided wherein the plug connector defining a mating tongue, is made with a pair of insert molding housings which are associated with the contacts thereof, commonly sandwiching a paddle card therebetween with a pair of power contacts exposed on two opposite lateral sides to form a sub-assembly. The corresponding receptacle connector defines a receiving cavity to receive the mating tongue of the plug connector. The plug connector defines a V-Bus clip surrounding the mating tongue for power transfer and the receptacle connector includes a pair of deflectable power contacts by two sides of the receiving cavity.