Listed is a Matrox Dual Head2Go unit with USB power connector.  These units are used to split video output into multiple monitors.  Tested, works great and in excellent cosmetic shape.  Sale only includes module and USB connector.   Please check the pictures and contact me if you have any questions.  Please note that I have multiple units, only one of them has the serial number shown in the pictures.  I can offer a discount if you purchase multiple units, if interested please contact me before you make your purchase.