Now OWI brings the Sumo tradition to your home, and you can build your wrestling participant with all that comes win this robot building kit. The robotic super warrior, Sumo Robot from the Elenco's Sumo Robot Building Kit, can be controlled to assail and overpower its opponent or retreat to prepare for battle. Sumo wrestling robot features an infrared sensor beam that is emitted when detecting an opponent. Upon detection, it instructs the brain of Sumo Robot to charge, thereby creating abonafide wrestling match! Movement: 2 tractor style wheels powered by 1 DC motor. Control: infrared sensor, detectable range approx. 350mm (max.). Sumo Robot Building Kit requires 4 AA batteries.