General integrated graphics VGA interface may not support EDID, graphics card support EDID. Lock screen can be used when the virtual display is not used. ( Can not be connect external Display ) Remote control of the computer screen resolution can be set very high, not the lowest resolution black screen state. Scientific calculation when the graphics card to work properly, heat normal. solve the mining without any reason to stop, the graphics do not work the problem. Low-cost solution instead of the display, can be used as a test card and related applications. Colour:Black Material:PC + metal Package Contents: 2 * VGA Virtual Display Adapter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.