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AQVOX low noise linear USB connection power supply for DAC's USB input for sale.  Best way to explain this is it connects in-line between your dac's usb input and your usb output cable from your computer and provides independent power to the usb connection instead of relying on the computer for that.  It's not an overall power supply to the DAC.  Top reviews available online for this unit in excellent condition.  Includes transformer for use in the US.  $95 plus insured shipping to CONUS only.