How these vehicles work is a bit mysterious, but we're sure your children will love watching this 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, instructions and 4 "AG13" button batteries. Train, 3½" long x 1¾" wide x 2" tall.

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