An electronic device includes an enclosure, a protecting member, and a power plug. The enclosure includes a top wall, a bottom wall, sidewalls, a socket, and a slot to receive an electronic card. The socket and the slot are defined in one of the sidewalls. The protecting member includes a receiving portion bounding the socket and the slot and a sliding plate capable of sliding to an open position and a closed position in the receiving portion. Movement of the sliding plate in the open position does not allow insertion of the power plug into the socket and allows the electronic card to be inserted into or removed from the slot, and movement of the sliding plate in the closed position allows insertion of the power plug into the socket and does not allow the electronic card to be inserted into or removed from the slot.