K'NEX Controlled Crane Building SetBuild a replica of a working, motorized crane with the K'NEX control crane building set! With over 800 parts, This set is a true builder's dream. It includes a battery powered motor that can be repositioned to control 3 different working Features: rotating the jib back and forth, positioning the trolley, or raising & lowering the hook. Cardboard cargo boxes are also including, so you can practice picking up and setting down cargo! Easy to follow, step