Momentum Men's 1M-CD70S2 Lugano Silver Dial Black Alligator Leather Watch Powered automatically with the movement of your arm, this Momentum timepiece features quality automatic movement, functions without a battery, and accessorizes with timeless style. Hesalite-acrylic crystal Case diameter: 44.95 mm 316l-stainless-steel case Water resistant to 165 feet (50 M): suitable for swimming and showering