👍【DESIGN AND MATERIALS】:Automatic Mens Wrist WatchesMechanical Movementunique Skeleton tourbillon design.Stainless Steel Bracelet Can Be Adjusted (If the Size is Not Suitable Please Contact us for Solution)Please Do Not Return The Goods Directly Please Contact us First.Our Service Have Been Praised And Pursued By Many Customers 👍【FUNCTION AND AFTER-SALES】: Mechanical Watch With Moon Phase Week Calendar Calendar Roman Scale Bezel and Luminous Hands And MarkersThere are 3 kinds of mirrors to choose from (green face blue face black face)。Water Resistant To 30m (330 Ft): In General Suitable For Swimming But Not Scuba Diving.The watch has a 2-year warranty and a service life of up to 10 YEARS 👍【STANDARD SIZES】: Swiss Brand Self Winding Watch Mirror Diameter 1.61Inches/41MM Round Metal Case Thickness 0.49Inches/ 12.5MM Stainless Steel Bracelet Length: 8.66 Inches/220MM Width: 0.78 Inches/20MM Weight 5.39oz/153G Water Resistant To 30m 👍【WATCH OBJECT/USE SCENE】: Classic Butterfly Buckle And Safety Closure Screw-Down Crown And Exhibition Caseback; Classic Watch Suitable For: Adult Father Brother Boyfriend Husband Student Man. Suitable For Outdoor And Indoor Sports Such As Running Climbing School Season Christmas Valentine's Day Wedding Birthday Father's Day Birthday Party Weddings Business Events As Well As Gifts 👍【WORKING PRINCIPLE】: working principle of a mechanical watch is to rely on the swing of the arm to produce energy to make the watch work normally so it needs to be worn for 8-10 hours a day to ensure accurate timekeeping. If you find that the time is wrong please turn the handle 30-40 laps with the handle closed and check the time before it can work normally. It is recommended to rotate 30-40 laps directly for the first use