Optoma HD DLP 1080P 3500 Lumen Compact Short Throw Projector (EH415ST) Powerful 0.5:1 short throw lens delivers crisp images in a short distance (2.7 to 5.54 from wall) Full 1080p HD resolution with 2x HDMI 1.4a connectivity Bright 3500 lumens image with 15,000:1 contrast ratio. Easy connectivity - 2x HDMI and built-in 10W speaker Full 3D compatibility for audience captivating immersive presentations