... which use 2 CCD lens that locate on the top-left and top-right of the touch frame, and ... CCD lens and make an optical network on the surface, when some point of the surface was touched, ... Also we can cut the frame size according to the customer’s requirements.Standard Size ( Customized size ... no special surface coatings)Touch methodFinger, glove hand, pen, any other pointer or opaque object Stylus minimum ...