Triumph Motorcycles Men's Japanese Automatic ion-Plated-Stainless-Steel and Leather Casual Watch(Model: TRIUMPH-3027-05) Quality Japanese Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Mineral crystal Case diameter: 40 mm Ion-plated-over-steel case; Gold dial; Date function Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving