Sewell HDdeck USB to HDMI Video + Audio Output 2 in 1 via a Single HDMI Female Connector Allows you to add an extra display to your desktop or laptop through the USB 2.0 Port with minimum configuration. Add up to 4 extra monitors on a Mac or 6 on a PC. No Additional Graphic Card is Required (utilizes internal Graphics Card in computer) Video Resolutions Supported: 640x480, 720x480, 768x576, 800x600, 1024x768, 1280x720 (720p), 1280x1024, 1360x850, 1400x1050, 1440x900, 1600x1200, 1680x1050, 1920x1080 (1080p) Supports up to 6 Displays for PC and 4 for Mac Simultaneously