Stuhrling Original Men&#39;s 160A.332B61 Special Reserve Apocalypse Skeleton Automatic Rubber Strap Watch Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Reliable automatic-self-wind movement 20 Jewels Hand Engraved Skeletonized Movement & Rotor accented with Blued Steeled Screws Krysterna Scratch resistant crystal Water resistant to 165 feet (50 M): suitable for swimming and showering