From Seiko, the Prospex Automatic Silicone Strap Men's Watch features:  Stainless steel case Black silicone strap Black ceramic one-way rotating elapsed timing bezel White dial with 3-D pressed pattern reflecting the bezel edge shape LumiBrite hands and markers Sapphire crystal with anti-reflective coating on the inner surface 23 jewels Automatic dive Manual and automatic winding capabilities Approx. 21,600 vibrations per hour Power reserve approx. 41 hours Magnified date calendar Screw down crown and case back Caliber 4R35 Case diameter approx. 44mm Water Resistance: 200 meters (660 feet) Diver's watch Follows ISO standards and is suitable for scuba diving Imported.