Description: [Working Priciple]: The picture is not projected onto paper, through the lens sheet, you can see that the picture is imaged on the drawing paper. The you can painting by the copied image. [How to Use]: Insert your phone to the top of the holding rack. Then place the mirror below in the given indent. Choose an image you'd like to draw on your phone Insert paper or another material below the mirror, and start tracing. [ ] Made of gigh-grade ABS, the plastic board is not easy to break, durable to use. [Compatability]: Support for most mobile phones and tablets. [Great Tracing Painting] Perfect for children, adults, teachers, home artists, etc. Specification: Material: Plastic Size: Approx. 14.3x1.2x20.5cm / 5.62x0.47x8.07inch Package Includes: 1 Piece Optical Drawing Board(4 Pack) Note: Tracing board has two sides, front and back, the projection effect of two sides is different, please use the front.