Issey Miyake Men's Automatic Stainless Steel Dress Watch(Model: SILAS004) Quality automatic movement; functions without a battery; powers automatically with the movement of your arm Watch does not require battery to operate, watch powered by the movement of your arm Stainless steel case and bracelet with Ion plating Gray industrial styling Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving