Prospex Save the Ocean Special Edition"Manta Ray" themed gradient blue dial with stamped wave patternAutomatic DiverManual and automatic winding capabilities21,600 vibrations per hourPower reserve: approximately 41 hours23 jewelsBlack ceramic uni-directional rotating elapsed timing bezelMagnified date calendarLumiBrite hands and markersSapphire crystal with anti-reflective coating on the inner surfaceScrewdown crown and Special Edition casebackCase diameter: 44.0mmStainless steel caseDeep blue silicone strapWater Resistance: Diver's Watch 200 meters (660 feet). Follows ISO standards and is suitable for scuba diving.Caliber 4R35