The educational projector should have: 1 and clear handwriting. Educational projectors generally display characters and images with a resolution of at least 1024*768 and a contrast of more than 3000 lumens, so that students in the back row can see the handwriting on the projection screen clearly; 2, short focus big picture; 3, the color is accurate; 4, simple operation; 5, a variety of connection methods and other characteristics.