Swiss Legend Men&#39;s 20078A-SB-01 Chrono Round Speedster Swiss Automatic Watchwith Winder Precise 18-jewel Swiss-automatic movement; functions without a battery; powers automatically with the movement of your arm Scratch-resistant sapphire crystal; black ion-plated stainless steel case; black rubber strap Date function Black textured dial with luminous hands and arabic numerals; black ion-plated bezel with silver-tone accents; silver-tone buckle and screw-down crown; watch winder included Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving