Invicta Men&#39;s 7136 Signature Collection Corduba Automatic Skeleton Watch Quality Japanese-automatic movement; functions without a battery; powers automatically with the movement of your arm Durable mineral crystal; brushed gold tone stainless steel case; black techno strap Black dial with skeleton window; luminous hands; exhibition case back; crown with unique screw down protective cap Water-resistant to 660 feet (200 M)