This unit is functional using just the power availablefrom a USB port. However, with all ports under full load, an external powersupply may be needed. I don’t sell these units (they are optional, and notfurnished with this unit) but they are available from other sellers.Search for StarTech SVA5M4NEUA.

I apologize in advance for slow shipping. Broke my hiplast month, and can’t drive yet. Have to ask friends for favors to get this tothe Post Office.