If you can not discern any change, plug unit in and have system search for new devices.
Have you ever heard of SDR radio and software? You can download free SDR software(Sharp, for instance) and see if the sdr software can recognize the port.
I have 2 one like you posted it came with a E-cig and one that has a short cord that goes to the usb port the black box looks the same on both
the led changes color when your cig is charged.