Automatic. Hand winding capability. Power reserve: approx. 45 hours. 28,800 VPH. 34 jewels. Sapphire crystal with inside anti-reflective coating. Screwdown caseback and crown. LumiBrite hands and markers. Tri-fold push button release clasp with extender. 47.0mm diameter. Water Resistance: Diver's Watch 200 meters (660 feet). Meets ISO standards and is suitable for scuba diving. Caliber 8R49. Black zirconia ceramic bezel. Stainless steel case and bracelet with super hard coating.