Sinn watch u2 ezm 5 rubber the u2 ezm is a professional diving watch that is made of german submarine steel this material is protected from high pressure magnetic influences high and low temperatures and seawater penetration sinns special dehumidifying technology is used as well the timepiece comes with a second time zone on a 24 hour basis additional functionalities include captive divers bezel with minute ratcheting a date window at 3 o clock mission timer design crown at 4 o clo