Fire Engine Line Sensor Vehicle

How these vehicles work is a bit mysterious, but we're sure your children will love watching this fire truck and train drive around and around their drawings. A small optical sensor on the bottom allows the vehicles to follow any thick black line made from a marker or crayon on a white piece of paper. Each vehicle includes one black marker, a test track, operating instructions and 4 button "AG13" batteries. Fire Engine measures 8cm long x 4cm wide x 4cm high. Recommended for ages 6+.