Seiko Men's SNZB73 Seiko 5 Automatic Black Dial Stainless-Steel Bracelet Watch Automatic movement; functions without a battery; powers automatically with the movement of your arm Functions without a battery; powers automatically with the movement of your arms Stainless steel case; black dial; day-and-date functions Case diameter: 43 mm Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion