316L Surgical-Quality Stainless Steel CaseJeweled 2560 Automatic MovementJewel Bearings: 22 Jewels41 Hour Power ReserveBeats per Hour (BPH): 21600/HourSapphire-Coated Mineral CrystalObservation Case back to view MovementUni-Directional BezelScrew-Down CrownLogo-Engraved Stainless Steel ClaspLuminous HandsLuminous MarkersDate Display41mm Case Diameter20 ATM (Professional Diver Water Resistance) Colour: blue