Abstract: An engaging module is used for engaging a cover to a housing. The housing includes a sliding chute extended along a direction. The engaging module includes a sliding member and a hook. The sliding member is slidable between an opening position and a closing position in the sliding chute. The sliding member includes a latch including a first guiding surface and a second guiding surface. When the cover is engaged to the housing, the sliding member may be moved to the opening position along the direction to make the first guiding surface of the latch push the cover to separate from the housing. When it is desired to engage the cover to the housing, the hook is pushed toward the second guiding surface, the sliding member is moved from the closing position along the direction, and the sliding member is moved toward the closing position so that the latch is engaged to the trough of the hook.