Inside the watch is the venerable eta 7750 automatic movement with 25 jewels 48 hour power reserve and a smooth dependable chronograph with 12 hour counter this is displayed behind a sapphire crystal with anti reflective coating this is all fitted inside a solid titanium case water resistant to 500 metres of static water pressure and is fitted with an automatic helium release valve to release pressure inside the case the case has a uni directional bezel with tungsten top ring for optima