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Weasel is a tenacious little robot warrior that embodies two sensors that allow it to see a line or feel its way along walls and around corners. The two motors and contact sensor activate the wall sensing micro switch to control the motors' on/off operation that determines the path of a wall. It is the classic robot design using the Left Hand Rule to escape mazes. With OWI's continued pursuit in making robots smart, they have added an additional feature to this little bundle of energy a sonic tracking system. Underneath Weasel's sturdy plastic base, you will discover photo- transistors that enable it to detect and follow a black line. Wow! Weasel still has more features! Want speed? Well, its three-speed gearbox will help navigate at the velocity you determine. Quick and easy to assemble, this is a beginner robot that make great entrants for robotic competitions, robotic workshops, after-school programs, special events, gifts, science enrichment camps, and classroom activities. Requires two AA batteries.