Spectacular 115 WXGA image from inches away Project large 115-inch WXGA images from only inches away with the bright 3600 lumen Optoma W330UST. Its 20000:1 contrast ratio and ultra short throw ratio of 0.25 make it ideal for space-constrained environments such as small classrooms meeting rooms house of worship and boardrooms. A PC-free image viewer and document reader display office documents PDFs and images from USB storage devices. HDCast Pro connectivity provides wireless screen mirroring with Android Mac OS and Windows devices. LAN display supports up to 4 simultaneous computers while USB display mirrors Android and iOS devices. Four corner geometric correction allows flexible installations while robust input options include HDMI VGA and RJ-45 for connectivity to a wide range of devices. DLP Technology DLP (Digital Light Processing) is a proprietary technology from Texas Instruments that offers digital projection with higher contrast faster response time good pixel structure and virtually no color degradation. Ultra Short Throw Ultra short throw projection enables closer placement to the wall with reduced shadows for easy presenting. The placement makes it perfect for interactive applications and education environments too. PC-free USB Image and Document Viewer Integrated PC-free image and document viewer provide direct viewing of office documents PDFs images and presentations from any USB storage device. HDCast Pro Wireless Display and Document Casting Screen mirror Android Windows and Mac devices wirelessly; Cast images and documents from Android iOS Windows and Mac devices or use USB Display to screen mirror Android and iOS devices. RS-232 Control Take control of the projector using HEX or ASCII commands via RS-232 cable. Four Corner Adjustment Four corner geometric correction enables quick and easy image adjustments from any of the corner points of the image. This is ideal for uneven or angled projection surfaces.