The HDMI EDID Ghost from Black Box optimizes video output for any display. It learns Extended Display Identification Data (EDID) from a display and ensures that your video source conforms to optimal resolution settings. The Ghost function saves the EDID of your displays and enables the source to boot with the correct settings. The unique audio inventory feature provides 5.1 and 7.1 channel audio EDID learning. A built-in rotary switch allows you to manually select and compare video resolution.