【Optical Imaging Principle】: The image is projected onto the drawing paper. Through the lens sheet, you can see the image projected onto the drawing paper. The drawing board has two sides, front and back; the projection effect on the two sides is different, please use the front side. You can adjust the brightness of your phone or tablet to your desired effect. 【No Overlapping Shadows & Clear】: The lens sheet is made of high-quality PC material, with good toughness and is not easy to break. No need to print any pictures, environmentally friendly and energy-saving. Clear images on the transparent board provide you with a fantastic drawing experience. 【Supports Mobile Phones & Tablets】: There are two splicing methods for brackets, easy and quick to assemble, suitable for most mobile phones and tablets. 【Smart APP】: You can download the \"Pencil Sketch\" APP or other related software on your mobile phone or tablet, select your favorite pictures and convert them into a sketch, and then start painting. (Make sure to mirror the image on your phone or tablet before drawing, otherwise you will find that the image is drawn in the opposite direction.) 【Ideal Tracing Tool】: This tracing board kit is suitable for children, kids, students, adults, beginners, anime enthusiasts, and hobby painters. You can paint on paper, clothes, bags, etc., without hurting your eyes.