An electrical connector includes an insulator adapted to be downwardly assembled into the housing of the cradle, and a set of contacts upwardly assembled into the insulator. Each contact includes a vertical retention section received in the corresponding retention slot in the insulator via an upward insertion process, and an upper spring arm extending from an upper edge of the retention section for mechanically and electrically connecting to the machine case, and a lower spring arm extending from a lower edge of the retention section for mechanically and electrically connecting to the cable. The free end of the upper spring arm is downwardly abutted against by the insulator while that of the lower spring arm is not.