ViewSonic PS501X 3500 Lumens XGA Education Short Throw DLP Projector - 1024x768 - 0.61 Throw Ratio - 22000:1 Dynamic Contrast Ratio - Built-in 2W Speaker - RS-232 - HDMI 1.4 - 2x VGA-in - VGA-out - Composite - 3.5mm Audio In&Out - USB 2.0 Type-A