Double-User Infrared Interactive whiteboard with Built-in Projector Double-User Infrared Interactive whiteboard with Built-in Projector(Built-in Speaker,computer,wireless Board Using 2.4GRF optional)Special features:1 Doual-user write at the same time+projector+mobile stand,all in one set,service at one station;2 Multi-touch,various gesture recognition functions,convenient and widely use;3 High ...