Watch Specification Model:SD1981 Movement: Japan NH35 automatic, 41 hours of energy storage. Case material:316L stainless steel Case back: 316L stainless steel Bezel: 120 click unidirect rotational ceramicbezel Watch mirror: sapphire crystalwith transparent AR coating. Water resistance: 200 m /20 ATM Luminous: Swiss C3 green and BGW9 blue super luminous. Crown: Screwdown Crown Case back:Screwback Case Watch Dimension Case diameter:43.8mm(withoutcrown) Case length: 46.8mm(lug to lug) Case thickness: 13.5mm Lug width: 20mm Our service Warranty:2 years Returns policy:Please check the websiteReturn / Exchange / Warranty Policy Style: automatic watch, dive watch, luxury watch Package: watch, box,warranty card, user manual Service: Support retail, wholesale. OEM/ODM.Please contact the seller if necessary.