An electronic device includes an enclosure, a side-plate to extend horizontally along a side surface of the enclosure, the side plate including a first horizontal guide, a second horizontal guide and a vertical guide extending vertically from an operating position of the first horizontal guide, a pivot lever to extend horizontally along the side plate, the pivot lever having a fulcrum being engaged with the second horizontal guide, an action point being engaged with the first horizontal guide and a force point, a lifter being engaged with the action point of the pivot lever upon the action point being at the operating position of the first horizontal guide, and a first connector to be disposed at an upper portion of the lifter and to be protruded from the enclosure upon the lifter being moved up by pivoting the pivot lever.