An electronic device includes a frame defining a slot and a first through hole, a slot cover moveably received in the slot, a latching member rotateably connected to the frame, and a torsion spring. The latching member includes a first arm and a second arm protruding therefrom and extending in opposite directions. When the latching member is at a locking position, the first arm faces the first through hole, and the second arm engages an elastic hook to retain the cover in the slot. The spring includes a first arm fixed to the first arm and a second arm fixed to the frame. The latching member is driven to rotate when the first arm is pushed by an elongated object passing through the first through hole, causing the second arm push the elastic hook to be deformed, thereby allowing the second arm to disengage from the elastic hook.