A receptacle connector includes: a housing including a base and a mating tongue in front of the base, the mating tongue defining a thickened portion at a root to the base, the mating tongue defining a pair of lateral locking sides; two rows of contacts with contacting section exposing to opposite surfaces of the mating tongue in front of the thickened portion and tail sections extending out of the base; and a metallic shield retained on the base and surrounding the mating tongue to define a mating cavity among the shield and the mating tongue. The shield is formed via a deep drawing process.