Prospex U.S. Special Edition Celebrates Seiko Prospex's ongoing efforts to promote ocean exploration and conservation Automatic diver with manual winding capability 21,600 vibrations per hour Power reserve: approximately 41 hours 24 jewels Black ceramic unidirectional rotating elapsed timing bezel Intricately patterned turquoise dial inspired by the turtle shell Day/date calendar with day in both English and Kanji LumiBrite hands and markers Sapphire crystal with anti-reflective coating on the inner surface Screwdown crown Screwdown Special Edition caseback with sea turtle image Case diameter: 45.0mm Stainless steel case and bracelet Water-resistant to 200 meters (660 feet), Diver's Watch. Follows ISO standards and is suitable for scuba diving Caliber 4R36 Packaging: supplied in standard Seiko packaging. This applies to all models, including Special and Limited Editions.