Spectacular 115” WXGA image from inches away Project large, 115-inch WXGA images from only inches away with the bright 3, 600 lumen Optoma W330UST. Its 20, 000:1 contrast ratio & ultra short throw ratio of 0.25 make it ideal for space-constrained environments, such as small classrooms, meeting rooms, house of worship & boardrooms. A PC-free image viewer & document reader display office documents, PDFs & images from USB (Universal Serial Bus) storage devices. HDCast Pro connectivity provides wireless screen mirroring with Android, Mac OS & Windows devices. LAN display supports up to 4 simultaneous computers while USB (Universal Serial Bus) display mirrors Android & i OS devices. Four corner geometric correction allows flexible installations while robust input options include HDMI, VGA & 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 & 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 & education environments, too. PC-free USB (Universal Serial Bus) Image & Document Viewer Integrated PC-free image & document viewer provide direct viewing of office documents, PDFs, images & presentations from any USB (Universal Serial Bus) storage device. HDCast Pro – Wireless Display & Document Casting Screen mirror Android, Windows & Mac devices wirelessly; Cast images & documents from Android, i OS, Windows & Mac devices or use USB (Universal Serial Bus) Display to screen mirror Android & i OS 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 & easy image adjustments from any of the corner points of the image. This is ideal for uneven or angled projection surfaces.