Mastop Unisex Black Leather Stylish White Skeleton Dial Hand-Wind Up Mechanical Casual Wrist Watch Japanese automatic movement with analog display The watch is powered by the motion of the wearer's wrist. If the watch is not worn for 8 or more active hours per day, it will run slower than usual or even stop briefly. Classic,simple,versatile design with large ,easy-to-read dial, Living waterproof design (Not suitable for swimming, diving, shower, etc.) Automatical Mechanial Self-Winding Movement