Digital HDMI sources deliver sharper, clearer image quality; the Optima S311 provides 2x HDMI ports to display them. With a powerful 3200 lumens and a remarkable 20,000:1 contrast ratio the Optima S311 delivers presentations with incredible image clarity, vibrant, accurate colors and easy to read text and graphics. Displaying even the most subtle details in your presentations to help you win your audience. Perfect for use in medium sized conference rooms, training rooms, classrooms, and houses of worship. The Optima S311 includes an extensive list of advanced features, including 2x HDMI v1.4a ports with full 3D compatibility, USB type-A with 5V DC 1A power, mini USB-B for remote mouse convenience, 1.1X zoom lens, built-in 2W speaker, RS-232 connectivity, ultra-long lamp life, whisper quiet fan and much more.