Features:Principle of Optical Imaging: The picture is not projected onto paper, through the lens sheet, you can see that the picture is imaged on the drawing paper. Tracing board has two sides, front and back, the projection effect of two sides is different, please use the front.Support Mobile Phones & Tablets: There are 2 splicing methods for bracket, simple and quick to assemble, support for most mobile phones and tablets.Smart APP: You can download APP "Pencil Sketch" or other relative software to your mobile phone or tablet, choose your favorite pictures and convert it to a sketch, and then you can start to paint.Environmentally Friendly: The lens sheet is made of high quality PC material, good toughness, not easy to break. You do not need to print any pictures, environmental protection and energy saving.Ideal Tracing 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, anime enthusiasts, amateur painting enthusiasts.