Magic inductive truck car toy

Scale: 1:8
Material: ABS plastic
Styles: car, truck, tank, train (color selected randomly) 
Suitable for children from age 6+ years

Instructions: 
Use an ordinary dark colored crayon or marker to draw a line on a white piece of paper.
Switch on the button of the car.  
Place the car on top of the drawn line.  
The car will drive on the line automatically.  
If the line is finished, the vehicle will continue in the direction followed from the previous line.  
If the line is too thin, the vehicle may stray off the line - make sure to draw the line thicker. 
If you place the machine somewhere else it will run in circles only until it finds a line.  
With an optical sensor that reads the black line drawn on a white piece of paper.  
You child can make up their own road map. 
The car is powered by 4 x AG 13 button cell batteries (not included). 
Marker pen included.  
The line: not under 4 mm, not over 10 mm, only oval lines.