smart distribution board. Wait, quiet performance is poor, active , poor performance, quiet. Observations are made without their notification. Because the students are in the lower grades of the primary school , most of the students are active , it is difficult to distinguish between active,. 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.