Omega Men's 2254.50.00 Seamaster 300M Chrono Diver Watch Quality Swiss Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Domed, anti-reflective scratch-resistant sapphire crystal Case diameter: 41 mm Stainless-steel case; Black dial; Date function Water resistant to 990 feet (300 M):suitable for scuba diving to a depth of 30 meters for up to 2 hours