Rolling Ball Clock This Time Machine is the clock that is fun to watch. Just turn it on, and its precise synchronous motor transfers a ball every sixty seconds for perfect time keeping. The first and second tracks display the minutes and the lower track displays the hour. Powered by (4) C Batteries (NOT included). There's a socket for an optional six volt AC adapter ( NOT included). Includes free plastic display cover . A masterpiece in chrome and black. Size " 10"x6"x8" . Shipped within continental US ONLY.