ESS Men's Silver Skeleton Mechanical Automatic BLACK Leather Watch Mens White Dial WM349 Automatic mechanical movement : Please wind up the watch before every usage. Automatic movements mark the passage of time by a series of gear mechanisms, and are worked by the movement of your wrist as you wear it. It will stop if the watch stop moving for a long time, please turn the crown of watches by hand.Please keep the watch away from magnet to avoid making the watch stop working. Design concept :Steam Punk Appearance and Skeleton Design,Beautiful glass back,Insight into the mechanical work movement; Classic hollow vintage dial will give you an extraordinary artistic beauty; With Old scale numerals,Stainless steel watch case back makes the watch more durable; Mineral glass and luminous hands (The darker night becomes, the lighter luminous hands change) Case size: Diameter: 48mm(1.88 in), Thickness: 15mm(0.59 in), Band width: 22mm(0.86 in); Water resistant to 10M, suitable for light spay, perspiration and light rain. Best Gift: As with a free gift box, it's a best Birthday gift Or holiday gift.