Optical Imaging Painting - The picture is not projected onto paper, through the lens sheet, you can see that the picture is imaged on the drawing paper. Please note: Tracing board has two sides, front and back, the projection effect of two sides is different, please use the front.(Please tear off the protective film on both sides of the lens before using.) High Quality Material - The lens sheet is made of high quality PC material, good toughness, not easy to break. Optical coating lens can reduce ghosting. Apply for Mobile Phones & Tablets - There are 2 splicing methods for bracket, simple and quick to assemble, support for most mobile phones and tablets. Easy to Use - You can download an APP to your mobile phone or tablet. The APP have multiple functions and can be used to make various custom adjustments to the image. Second, choose your favorite pictures and adjust it. Then, put the phone or tablets on the shelf, and then you can start painting without drawing skills. Ideal Drawing Sketching Tool - This tracing board kit helps to develop hand-eye coordination and basic drawing skills, no harm to your eyes. You can paint on paper, clothes, bags and so on, suitable for children, kids, students, adults, beginners, amateur painting enthusiasts.