... 4:3) Infrared interactive Whiteboard Appearance Metal nano,high gain, can write by whiteboard ... 4:3) Infrared interactive Whiteboard Appearance Metal nano,high gain, can write by whiteboard marker ... 16:9) Infrared interactive Whiteboard Appearance Metal nano,high gain, can write by whiteboard marker ... 16:9) Infrared interactive Whiteboard Appearance Metal nano,high gain, can write by whiteboard marker ...