Watch Specification Model: SD1996S/SD1973S Movement: Japan NH35 automatic, 41 hours of energy storage. Case material:Cermany Cusn8 bronze Case back: 316L stainless steel Bezel: 120 click unidirect rotational ceramic bezel Watch mirror: sapphire crystalwith AR coating. Water resistance: 200m /20 ATM Luminous: Swiss C3 green super luminous Crown: Screwdown Crown Case back:Screwback Case Watch Dimension Case diameter:41.2mm(withoutcrown) Case length: 46mm(lug to lug) Case thickness: 13.5mm Lug width: 22mm Our service Warranty:2 years Returns policy:30-day return and refund Style: automatic watch, dive watch, luxury watch Package: watch, box,warranty card, user manual