An electronic device comprising a device housing (490) having a housing opening; a receptacle connector (140) having a connector housing (142) that defines a cavity (147) aligned with the housing opening and extending into the device housing (490), the connector housing including first and second opposing interior sides extending into the device housing and third and fourth opposing interior sides extending between the first and second opposing sides into the housing; first and second opposing spring retention contacts (145a, 145b) both having a curved contact surface that extends into the cavity (147) from the third interior side for the first retention contact (145a) and from the fourth interior side for the second spring retention contact (145b); the receptacle connector (140) includes eight contacts (146(1)..146(8)) spaced apart in a single row; and first and second connector detect contacts (148(1), 148(2)) disposed within the cavity (147) slightly behind the rows of contacts (146(1)..146(8)) and on opposite sides of the plurality of contacts.