A housing is usable for positioning selectively a first electronic card having a first locking hole and a second electronic card having a second locking hole, and includes a base plate, a connector for mating with the selected one of the first and second electronic cards, and a movable element including a lever body that has an end portion connected pivotally to the base plate and a third locking hole opposite to the end portion. The lever body is operable to move the third locking hole between a first position, where the third locking hole is aligned with the first locking hole to cooperatively receive a fastener for fastening one of the first and second electronic cards, and a second position, where the third locking hole is aligned with the second locking hole to cooperatively receive the fastener for fastening the other one of the first and second electronic cards.