Diesel Men's Japanese Automatic Stainless Steel Casual Watch(Model: DZ9041) Precise, high-quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Durable mineral crystal; Stainless steel case and bracelet; Exhibition case back Textured skeleton dial with one subdial and luminous hands and hour markers; Stainless steel case back Stainless steel case back Water resistant to 99 feet (30 M): withstands rain and splashes of water, but not showering or submersion