A connector assembly includes a printed circuit board defining an inserting window and soldering holes adjacent to two sides of the inserting window, and an electrical connector assembled in the inserting window. The electrical connector includes an insulating body, terminals disposed in the insulating body and each having a soldering arm levelly extending rearward to stretch behind the insulating body, and a shell enclosing the insulating body and the terminals. Each side board of the shell has a substantial middle punched outward to form a soldering board extending levelly, and a lower part of a rear edge punched outward and then bent downward to form a soldering tail inserted downward in the soldering hole of the printed circuit board. The soldering boards of the shell and the soldering arms of the terminals are flush with one another to be levelly against and further soldered onto the printed circuit board.