Watch Specification Model:SD1975W Movement: Japan NH36 automatic Movement features: 3 pins/week/calendar, frequency 21600 times per hour (3Hz), stop second device, two-way automatic winding, 24 stone, 41 hours of energy storage. Case material:316L stainless steel Case back: 316L stainless steel Bezel: 120 click unidirect rotationalceramic bezel Watch mirror: sapphire crystalwith AR coating. Water resistance: 300m /30 ATM Luminous: Swiss BGW9 blue luminous. Crown: Screwdown Crown Case back:Screwback Case Watch Dimension Case diameter:47.5mm(withoutcrown) Case length: 44mm(lug to lug) Case thickness: 15mm 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