The Robotic Arm Trainer (wired control kit) teaches the basic robotic sensing and locomotion principles while testing your motor skills as you build and control the arm. You can command this unit with its five switch wired controller with lights to grab, release, lift, lower, rotate wrist, and pivot sideways 350 degrees. After assembly, observe the dynamics of gear mechanisms through the transparent arm. Five motors and five joints allow for flexibility and fun! Add-on with IBM PC computer interface useful tools (sold separately). 4 "D" batteries required (not included).