The compact body is packed with functions; The remote control box allows you to control the ball speed, pitch and oscillating angle remotely. Compatible with 1.6 inch (40 mm) balls only! All in one that can be started immediately from the day you buy it. Lightweight, compact, easy to assemble, and store. How about your own practice robot? Please rest assured that the main unit is the same as the time-tested Roboton 2040.Roboton 2040 is used in many schools and clubs.