An apparatus includes a connector and a connecting apparatus. The connector includes a first pin and a shell surrounding the first pin. The shell is insulated from the first pin. The connecting apparatus includes a main body, a second pin, and a third pin. The main body is connected to a bottom of the shell of the connector. First ends of the second and third pins extend through the main body, to be electrically connected to the first pin and the shell, respectively. Second ends of the second and third pins are exposed through a bottom of the main body.