... Screen 3 Infrared Touch smart whiteboard 4.PC 5.TV LCD Interactiv Touch Whiteboard, combined with advanced infrared touch technology, ... , No need to connect other projector, computer . Built in TV , support record contents, record audio, video, Buit in Computer ... 16:9Contrast Ration: 2000:1Brightness:>=550cd/m2Viewing Angel: 178°Color: 1.06 billion Infrared Whiteboard Parameter Response time(ms): ...