&lt;b&gt;Spectacular 115 WXGA image from inches away&lt;/b&gt;&lt;br /&gt;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.&lt;br /&gt;&lt;br /&gt;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.&lt;br /&gt;&lt;br /&gt;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.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;DLP Technology&lt;/b&gt;&lt;br /&gt;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.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Ultra Short Throw&lt;/b&gt;&lt;br /&gt;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.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;PC-free USB Image and Document Viewer&lt;/b&gt;&lt;br /&gt;Integrated PC-free image and document viewer provide direct viewing of office documents PDFs images and presentations from any USB storage device.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;HDCast Pro  Wireless Display and Document Casting&lt;/b&gt;&lt;br /&gt;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.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;RS-232 Control&lt;/b&gt;&lt;br /&gt;Take control of the projector using HEX or ASCII commands via RS-232 cable.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Four Corner Adjustment&lt;/b&gt;&lt;br /&gt;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.