Principle of optical imaging: The image is not projected onto paper. Through the lens sheet, you can see the image is mapped onto the drawing paper. Drawing board has two sides, front and back, the projection effect of two sides is different, please use the front side. You can adjust the brightness of your phone or tablet to the desired effect. No Overlap Shadow & Clear: The lens sheet is made of high quality PC material, good toughness, not easy to break. No need to print pictures, environmental protection and energy saving. Clear images on the transparent board bring you a great drawing experience. Support Mobile Phones and Tablets: There are two bracket splicing methods, easy and quick to assemble, suitable for most mobile phones and tablets. Smart APP: You can download "Pencil Sketch" APP or other relative software on your mobile phone or tablet, select your favorite pictures and convert them into a sketch, and then start painting. (Be sure to mirror the image on your phone or tablet before drawing, otherwise you will find the image is drawn in the opposite direction.) Ideal Search Tool: This search board kit is suitable for kids, children, students, adults, beginners, anime enthusiasts and hobby painters. You can paint on paper, clothes, bags, etc. without damaging your eyes.