... lens that locate on the top-left and top-right of the touch frame, and other 3 sides ... imaging (no special surface coatings)Touch methodFinger, glove hand, pen, any other pointer or opaque object Stylus ... Linux, Mac OSBasic functionsClick, double click, mouse function of right key and left key, etc. Package inside1set touch frame, ... interactive optical multi-touch by pen, glove hand,finger