The Optoma EH501 was designed to deliver unsurpassed performance & reliability to meet your installation needs. Its powerful 5000 lumens output & impressive 15, 000:1 contrast ratio deliver remarkably bright presentations with sharp text & color-rich graphics. To ensure it will perform to your current & future needs, the EH501 features a comprehensive I/O panel & the most advanced feature sets in its class. Outstanding features on this remarkable product include HDMI & DVI for digital connectivity, over-the-network presentation capability, wireless presentation capability via optional USB (Universal Serial Bus) dongle, vertical lens shift & discrete audio inputs including microphone input for maximum installation convenience.