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10 years + + Hyper Line Tracker
This cyber bug possesses a sonic tracking system, and is fortified with amultitude of sensors: photo transistors to detect a black line, trackingmemory to memorize its last track of the black line, and two red LED'sthat to tell you which side of the light sensor is activated.Hyper Line Tracker follows a designed course. By using an infraredemitter, light sensor circuitry, and tracking memory, it demonstrates howrobots see a pathway. Make a path with a black felt tip marker or blacktape and watch how infrared sensors enable the robot's motors tomake course corrections. Printed circuit board pre-assembled. Requires 4 AA batteries.