Abstract: A shock and water resistant wireless pager enclosure, and a tamper-proof lockable enclosure system. The enclosure comprises a bottom container, which supports a transparent film, secured by a cover hinged to the bottom container. The enclosure system comprises an enclosure cover provided with securing members which lockingly engage the bottom container. A lock release tool comprises latching means for engagement with the securing members, and a cam and cam followers which operate on the latching means to pull the securing members outwards to release the locked engagement.