The OPTOMA's XA520 XGA 3,800 lumens projector provides brilliant images and high contrast. Its Optoma True-Vivid™ color turning technology clearly displays images for higher quality colour, and its 26,000:1 high contrast ratio helps dark images have more depth. With a throw ratio of 1.95 to 2.15:1, you may set the projector far away from the screen without losing focus. The built-in USB power output can be utilized to provide power for your streaming dongles such as Chromecast, HDCast Pro, or mobile devices enabling you to connect your laptop, PC or Blu-ray player.