100mm (Length), 100mm (width), 100mm (height). It’s powered by two 7th batteries. The motor can respectively decrease and increase the output remote speed and torque through a gear drive. The eccentric power wheel at the two ends of gear case’s output shaft can allocate the driving force to the bilateral walking gears, thus allowing the to-and-fro movements of the robot. During the assembling process, student can not only get some knowledge about the mechanical drive system but also have improved operational ability. The walking robot looks very cute, so the students won’t feel bored.