Built to prevent intrusion by sand, mud or dust and to ensure reliable operation in the harshest environments, this tough structure is prepared to support training and actual missions in environments such as jungles and deserts. It's an ideal tool for rangers and rescue crews. NEW MUD-RESISTANT STRUCTURE A cylindrical guard structure is adopted for all the buttons, and the cylindrical button shafts are fitted with gasket linings. This structure not only protects the buttons against intrusion by dust and mud, but it also helps to alleviate shocks. The crown is also protected by a highly airtight screw-lock structure. Gaskets are installed at points where the crown meets the surface of the case to assure superior resistance to dust and mud.