designed in conjuction with and supplied to US Navy SEAL teams rigorous testing earned it official qualification for use in the US Navy and US Army meets military specifications of all branches of the US Armed Forces (MIL Spec # W-4637 4F) fiberglass reinforced polyester injection molded case stainless steel plate case back secured with stainless steel screws double gasket crown/stem confers water resistance of 20 atm/200 meters/660 feet unidirectional ratcheting bezel features bright traser "dot" encased in aluminum housing protected by sapphire glass window tempered scratch resistant mineral glass crystal multi-jewel Swiss quartz movement with date function, end of life (EOL) feature and 4 year battery life dive strap made of Arnitel with stainless steel buckle