Watch Specification Model: SF746 Movement type: Sweep second quartz movement Movement model: VH60 Battery model: SR920SW(2 years) Case material: 316L stainless steel Case back: 316L stainless steel Watch mirror: flat sapphire crystal with AR coating. Water resistance: 200m / 20 ATM Luminous: Swiss C3 green and BGW9 blue super luminous. Crown: Screwdown Crown Case back: Screwback Case Clasp: V2 6-hole adjustable milled clasp Watch Dimension Case diameter:39mm ( without crown) Case length: 49mm (lug to lug) Case thickness: 12mm Lug width: 20mm 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