BenQ MP780ST+ WXGA Short Throw 2500 Lumen 3D Education Projector 2nd Generation PointDraw Technology now with the all new "Dual Pen" mode QDraw 2.0 Interactive Software features two tool bars for "teacher pen" and "student pen" 3D ready to turn conventional classrooms into a whole new immersive learning environment that best suits today's young learners Calibration-Free Interactivity 20W Speaker Power and Microphone Input with LAN Display and USB Display