... 2.Fast response , and support dual touch .3.Very easy to maintain , just have 2 CCD cameras , 2 small ... PCB and reflective strip , very easy totake place when any one get problem . But for ... led on the board inside the4 frames , not so easy to maintain , etc .,Specification : MultiTouch Interactive Whiteboard Touch Technology:Optical ... 132097.6inch(16:10)2160×1400 Interactive whiteboard