An electronic device includes a housing and a connector mounted in the housing. An open portion is defined in the housing. The connector includes a mounting portion coupled to the housing, a rotating member rotatably mounted to the mounting portion and a tray mounted in the open portion. The rotating member includes a magnet arranged to one end of the rotating arm and a resisting portion extending from the other end of the rotating arm. The magnet is adjacent to an inside surface of the housing, and the resisting portion resists against the tray. The magnet rotates the rotating member to partly push the tray out from the open portion. The electronic device has a good sealing ability.