Sinn watch u2 sdr ezm 5 bracelet the u2 sdr is a professional diving watch one of its most prominent features is the use of german submarine steel which is resistant to magnetic fields water penetration and extreme pressure the movement is shock resistant sinns dehumidifying technology is used as well additional functionalities include captive divers bezel with minute ratcheting a date window at 3 o clock crown at 4 o clock second time zone mission timer design luminous dial elem