Watch Specification Model:SD1954 Movement: Japan NH35 automatic, 41 hours of energy storage. Case material:316L stainless steel Case back: 31 6L stainless steel Bezel:120 Clickunidirect rotationalceramic bezel Watch mirror: sapphire crystalwith AR coating. Water resistance: 300 m / 30 ATM Luminous: Swiss BGW9 blue super-luminous. Crown: Screw-Down Case back:Screwback Case Buckle: Upgraded 6 micro adjustment milled clasp Watch Dimension Case diameter:41mm(without crown) Case length: 48mm(lug to lug) Case thickness: 13.5mm Lug width: 20mm Our service Warranty: 2years Returns and Refund: 30 days return & refund service Package: watch,warranty card, user manual, plastic protecting box Style: mens mechanical watch, mens automatic watch, dive watch, luxury watch