Magic Inductive Tank "Follows the Line you Draw"

• Optical sensor that reads the black line drawn on a white paper
• Use an ordinary dark colored crayon or marker to draw the line
• Runs in circles only until it finds a line
• Powered by 4 x AG 13 button batteries. (Not Included)
• Operates with line thickness of 4mm to 10mm and without sharp-angles
• Size: Approx. 7cm x 4cm x 5cm

 See videos below: