... 4:3) Infrared interactive Whiteboard Appearance Metal nano,high gain, can write by whiteboard marker and dry erase.Touch ... 16:9) Infrared interactive Whiteboard Appearance Metal nano,high gain, can write by whiteboard marker and dry erase.Touch square2072mm ... 16:9) Infrared interactive Whiteboard Appearance Metal nano,high gain, can write by whiteboard marker and dry erase.Touch square2288mm ...