An receptacle comprises a body, a plurality of terminals and a cage; a front end of the cage is formed with a mating cavity provided around a tongue and a receiving cavity positioned above and communicated to the mating cavity, and a transverse width of the receiving cavity is smaller than a transverse width of the mating cavity, the cage comprises a top plate, the top plate is provided with a receiving groove which is opened at a front end thereof, the top plate is bent rearwardly and extend to form bent portions from both sides of the receiving groove, respectively, the two bent portions extend rearwardly to from a locking portion, the locking portion is used for engaging the hook of the plug, the receiving cavity is formed between the locking portion and the top plate.