Stuhrling Original Men's Automatic Stainless Steel and Leather Dress Watch, Color:Black (Model: 166.3315N54) Quality automatic movement; functions without a battery; powers automatically with the movement of your arm Reliable automatic-self-wind movement 29 jewels Grand calendar with cay, date, month and year complications and open heart with faux tourbillion flywheel Krysterna scratch resistant crystal Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving