Follow Any Drawn Line Pen Inductive Robot Model Children Kids Toy Gift 5ML Features: FOR KIDS: Kids will be amazed at how the truck follows the line automatically and have great Just like magic! INDUCTIVE TRUCK: Optical sensor inside follow black lines drawn by any pen, limited to the pen came with the package. The car will turn in if placed elsewhere until it finds a black line to follow. CREATIVITY: Pre school kids or learning children can use their and to plan routes for the truck to follow. BATTERIES INCLUDED: Batteries already included. Turn the on, the car will start to run. USEFUL TIP: Line thickness should be within 4mm to 1mm. at a quarter inch (6mm). Product size: 6.5×4×5.8CM/2.6x1.6x2.3in How to play: Use an marker to draw a line on a white piece of paper Turn on on the button of the car Place car on top of the drawn line The car will run on the line automatically If the line is too thin, the car may stray off the line, please make the line thicker (The line should be a quarter inch in thickness ) Package Include: 1 x pen 1 x Inductive Car