Momentum Men's 1M-CD72S3 Lugano Rose-Tone Brown Alligator Leather Watch Quality automatic movement; functions without a battery; powers automatically with the movement of your arm Hesalite-acrylic crystal Case diameter: 42 mm 316-l-stainless-steel-and-18k-rose-gold case; copper dial; day function Water resistant to 165 feet (50 M): suitable for swimming and showering