A casing and an electronic device using the same are provided. The casing includes a housing, a cover and a connection element. The housing has an opening. The cover selectively covers or exposes the opening and includes a release portion. The release portion is for releasing a component located within the housing. The connection element connects the cover and the housing.

A casing and an electronic device using the same are provided. The casing includes a housing, a cover and a connection element. The housing has an opening. The cover selectively covers or exposes the opening and includes a release portion. The release portion is for releasing a component located within the housing. The connection element connects the cover and the housing.

An electronic card connector includes a metal shell, a terminal block and a tray. The metal shell is provided on a circuit board and cooperates with the circuit board to define a slot having an entrance. The tray has an insertion end which first enters the slot of the metal shell and two receiving portions which are respectively parallel to two sides of the inserting-ejecting direction and respectively correspond to two limiting arms of the metal shell. The tray further has two interference oblique surfaces adjacent to the insertion end, when the tray is improperly inserted under a state that the tray is turned upside down, the two interference oblique surfaces respectively abut against the two limiting arms, therefore the tray cannot enter into the slot.

An electronic card connector includes a metal shell, a terminal block and a tray. The metal shell is provided on a circuit board and cooperates with the circuit board to define a slot having an entrance. The tray has an insertion end which first enters the slot of the metal shell and two receiving portions which are respectively parallel to two sides of the inserting-ejecting direction and respectively correspond to two limiting arms of the metal shell. The tray further has two interference oblique surfaces adjacent to the insertion end, when the tray is improperly inserted under a state that the tray is turned upside down, the two interference oblique surfaces respectively abut against the two limiting arms, therefore the tray cannot enter into the slot.