[Optical Imaging Principle]: The image is not projected onto the paper.Through the lens you can see that the image is being copied onto the drawing paper.The drawing board has two sides, a front and a back.The projection effect from both sides is different.Please use the front page. [Support for mobile phones and tablets]: There are two bracket splicing methods, easy to assemble and quick to install, suitable for most mobile phones and tablet computers. [Environmental protection]: The lens blade is made of high quality plastic, good toughness and not easy to break.No need to print images to save environmental protection and energy. [Ideal Positioning Tool]: With the positioning board kit, you can improve hand-eye coordination and basic drawing skills without hurting your eyes.You can draw on paper, clothes, bags, etc. It is suitable for children, children, students, adults, beginners, anime lovers and amateur painters. Material: plastic Color: Black Size: The length, width and height of the assembly are about 10*7* 9.5cm, the length and width of the board are about 20* 13.5cm, error about 1cm Packing list: 1 * Sketch tool