digital board in school. Before entering the field observations , the need for teachers and relevant information, the use of materials, degree of recognition for teachers in theoretical models involved before entering the site , the researchers involved in the theory of experiments conducted teacher training Teaching Model The meaning, the role of interactive whiteboards in English teaching, etc. interviewed experimental teachers.. 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.