Certina DS Sport Chronograph Black Dial Black Rubber Mens Watch C027.417.17.057.01 Sapphire crystal - the triumph of modern science - most scratch resistant material on the market Quartz movement with analog display and sapphire crystal dial window Date calendar water-resistant, chronograph Black silicone stainless steel case with black dial Water resistant to 10 ATM / 100 meters / 330 feet : suitable for snorkeling as well as swimming but not diving