smart board touch screen. The choice of students is based on the usual understanding of the classroom teachers , based on the mastery of the students' double-base knowledge and the ability of the classroom verbal communication. Performance is good, active , performance is good, quiet performance is medium and active , in performance. The IQAio GR519 is an upgraded lightweight version based on the original IQAio GR511. The original dual-cavity structure was changed to a bottom-edge structure, so that the minimalist design accommodates modern classrooms and conference rooms. With one IQProjector V2 and one IQView E3821, you can achieve flexible and intelligent classroom.