Sinns 900 watch is a multi functional chronograph that comes equipped with precise features and various complications its movement is valjoux 7750 automatic that performs 28 800 vibrations per hour and has 26 bearing jewels extreme protection from magnetic fields is one of the watchs most prominent characteristics the case is hardened through the use of sinns tegiment technology a dehumidifying capsule protects the dial from fogging the timepiece comes equipped with various complications