Stuhrling Original Men's Automatic Stainless Steel and Leather Casual Watch, Color:Black (Model: 37BB.33152) Quality automatic movement; functions without a battery; powers automatically with the movement of your arm Reliable automatic-self-wind movement 21 jewels Master calendar with day, date, and month complications with animated AM/PM indicator Krysterna scratch resistant crystal Water resistant to 165 feet (50 M): suitable for swimming and showering