(mechanical) movement, which means it is self-winding and powered by the motion of your wrist—no batteries required.Design: The watch has a skeleton dial with a "see-through" design that reveals the inner gears and mechanical heartbeat of the watch.Case: A 45mm black-plated stainless steel case with a round shape.Strap: It comes with a 24mm brown leather strap featuring a buckle closure.Glass: The face is protected by a mineral crystal.Water Resistance: Typically rated for 50 meters (5 ATM), making it suitable for short periods of recreational swimming but not diving