Invicta Men's 2304 Pro Diver Collection Gold-Tone Automatic Watch Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Anti-reflective mineral crystal Case diameter: 49 mm 23kt-Gold-Plated Stainless-steel case; Black dial; Date window with magnifier; Unidirectional bezel; Exhibition caseback Water resistant to 660 feet (200 M): suitable for recreational scuba diving