Prospex Save the Ocean Special Edition Special Edition celebrating Antarctic conservation efforts Gradient blue-green dial evoking the icy seas, with die-stamped patterning to suggest penguin footprints in the snow Automatic diver with manual winding capability 21,600 vibrations per hour Power reserve: approximately 41 hours 24 jewels Bold, grooved uni-directional rotating elapsed timing bezel inspired by a classic Prospex design Magnified day/date calendar LumiBrite hands and markers Screwdown crown and caseback Case diameter: 42.4mm Stainless steel case and bracelet Tri-fold push button release clasp with secure lock and extender Water-resistant to 200 meters (660 feet), Diver's Watch. Follows ISO standards and is suitable for scuba diving Caliber 4R36