From Seiko, the Prospex Automatic Diver Black Dial Men's Watch features: Stainless steel case and bracelet Black ceramic one-way rotating elapsed timing bezel Black dial with 3-D pressed pattern Manual and automatic winding capabilities Approx. 21,600 vibrations per hour Power reserve approx. 41 hours 24 jewels LumiBrite hands and markers Sapphire crystal with anti-reflective coating on the inner surface Screw down crown and case back Case diameter approx. 45.0mm Water-resistant up to 200 meters (660 feet) Diver’s watch Follows ISO standards and is suitable for scuba diving Caliber 4R36 Imported.