316L Surgical-Quality Stainless Steel Case Jeweled Miyota 8215 Automatic Movement Jewel Bearings: 21 Jewels 36-Hour Power Reserve Beats per Hour (BPH): 21600/Hour Sapphire-Coated Mineral Crystal Observation Caseback to view Movement Uni-Directional Rotating Bezel 316L Surgical-Quality Stainless Steel Bracelet Logo-Engraved Fold-Over Push-Button Deployment Clasp Luminous Hands Date Display 40mm Diameter 10 ATM Water Resistance