... 2.TV,PC,whiteboard,projector combined 3.teaching,meeting,training,business 4.low price high quality DIGITAL 55" ... fingers or touch pen Teaching tools: compasses, ruler, protractor, set square... pictures amplify/move/erase/label... The curtain and backdrop function ... LED TV mainly applies to teaching, training, conferences, advertising, display, query, command and other applications… Welcome to us for ...