Optical LED Tracing Drawing Board Light Image Copy Pad Art Design Painting ToolsPrinciple of optical image tracing tool The image of the lens is not a projection, but the observation through a lens, you can see the image on the canvas. 2Material: optical ABS coated polymethyl methacrylate lens, durable. Compatible with mobile phones and tablets. you need to download the optical drawing application, put the phone on the shelf, and then you can start drawing without the need for drawing skills. Education: helps develop eye