This cable has a male USB A plug on one end and a DC 5.5mm x 2.1mm barrel plug, center positive on the other end. The length of the cable is about 1.5 meter.

This cable is handy if you want to power a device with barrel jack from a USB wall adapter or power pack. A USB port typically delivers between 4.75 to 5.25V DC power.

The 5.5mm x 2.1mm DC connector is very common in electronics world. We powered a BeagleBone Black with this cable plugged to a USB power supply.