Just use the marker and draw a line on paper, then set the car on the line and it follows the line! Amazing is’t it? The cars have an optical sensor that reads the black line drawn on a piece of paper. Simply draw a thick line that is at least a 0.3 inch thickness, place the car on the drawn line and it will run on the line automatically. Put as many of these toy cars on the track and they will not interfere with each other. How to play: 1. Use an ordinary dark colored crayon or marker to draw a line on a white piece of paper. 2. Turn on switch on the button of the car. 3. Place car on top of the drawn line. 4. The car will run on the line automatically. 5. If the line finished, the tank will continue in the direction followed from the previous line. 6. If the line is too thin, the vehicle may stray off the line, please make the line thicker ( the line should be a quarter inch thickness ). Features:

• The car powered by 4 x AG 13 button cell.

• Marker pen and batteries are included.

• The line: not under 4mm, not overrun 10mm, non sharp-angled line.

• Size: 6.6 x 4.5 x 4.3cm

• Weight: 142g

Package contents: 1 x Fangle car toy 1 x Magic pen 1 x Instruction manual 1 x White paper with black lines Color:Yellow,Blue