This is a USB boost cable which supports 5V power input and output 5V, 9V, or 12V three versions. And the input interface is USB, output interface is DC jack with 5.5-2.1mm.
Features:
USB input voltage: 5V
DC output voltage: 5V/9V/12V
DC plug size: 5.5mm(Outside Diameter)*2.1mm(Inside diameter)