Item Type: Projection Board_x000D_ Material: Plastic_x000D_ Weight: Approx. 139g / 4.9oz_x000D_ Transparent Board Size: Approx. 20x13.5cm / 7.9x5.3in 1The principle of optical imaging, the image is not projected on the paper, through the lens paper, you can see the image on the graph. 2The touchpad has two sides, front and back, and the projection effects on both sides are different, please use the front. 3The bracket has two connection methods, can be assembled quickly and easily, and supports most mobile phones and tablets. 4Smart APP, download the relevant software to the mobile phone or tablet, and convert the picture into a sketch, you can start drawing. 5Made of high?quality PC material, it has good toughness and is not easy to break, no need to print images, it is environmentally friendly and energy?saving. 6The tracking toolkit helps develop hand?eye coordination and basic drawing skills without causing eye damage.1 x_x000D_ _x000D_ Projection Board 5 x Bracket 1. Please allow 1?2cm error due to manual measurement. Thanks for your understanding._x000D_ 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.