316L Surgical-Quality Stainless Steel Case Jeweled Miyota 8215 Automatic Movement Jewel Bearings: 21 Jewels 42-hour power reserve Beats per Hour (BPH): 21600/Hour Sapphire-Coated Mineral Crystal Observation Caseback to view Movement Uni-Directional Bezel Screw-Down Crown 316L Surgical-Quality Stainless Steel Bracelet Logo-Engraved Fold-Over Push-Button Deployment Clasp Luminous Hands Date Display 50mm Case Diameter 20 ATM Water Resistance Professional Diver