Zenith Men's Automatic Stainless Steel and Rubber Sport Watch, Color:Black (Model: 03.0526.4021/21.R642) Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 46 mm Stainless-steel case; Black dial Water resistant to 990 feet (300 M):suitable for scuba diving to a depth of 30 meters for up to 2 hours