• Emits light sensor rays and judges by the reflection of obstacles in front
• Electric pulses to alter the rotating direction of the left side motor to evade obstacles
• Movement: 3 legs on each side by crank shaft(s), 2 DC motors
• Power: "AA" battery x 2 each, 9v x 1 each (not included)
• Control: infrared/photo transistor
• Size: H110 x L140 x W100mm
• Weight: 12.8oz