... 83(4:3) Infrared interactive WhiteboardAppearance Metal nano,high gain, can write by whiteboard marker ... 92(4:3) Infrared interactive WhiteboardAppearance Metal nano,high gain, can write by whiteboard ... 103(16:9) Infrared interactive WhiteboardAppearance Metal nano,high gain, can write by whiteboard ... 112(16:9) Infrared interactive WhiteboardAppearance Metal nano,high gain, can write by whiteboard ...