Stuhrling Original Men's Automatic Stainless Steel and Rubber Sport Watch, Color:Black (Model: 161A.331617) Quality automatic movement; functions without a battery; powers automatically with the movement of your arm Reliable automatic-self-wind movement 21 jewels Features rotating bezel and date window at the three o'clock position with magnifier Krysterna scratch resistant crystal Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving