Feature:1. Optical Imaging Principle: The picture is not projected onto the paper. Through the lens paper, you can see the picture on the drawing. The trackpad has two sides, the front and the back, and the projection effect on both sides is different. Please use the front.2. Support for mobile phones and tablets: The bracket has two kinds of splicing methods, which are simple and quick to assemble and support most mobile phones and tablets.3. Smart APP: You can download the APP "Pencil Sketch" or other related software to your phone or tablet, select your favorite picture and convert it into a sketch, then you can start painting.4. The lens is made of high quality PC material, which has good toughness and is not easy to break. You don't need to print any pictures, it's environmentally friendly and energy efficient.5. This Tracking Board Kit helps develop hand-eye coordination and basic drawing skills without causing eye damage. Specification:Material: PCSize: 20*15cmTips: Please tear off the protective film on the projection board before use.Package List:1 *Projection drawing board5 * bracket parts