Hello, I just need to know if I can power the Onyx cradle with USB power from a radio. I have a 1974 car with no cigarette lighter. I see for sale Kenwood head units with 2 usb connectors. I want to power the cradle with this. I don't see a usb cable with the appropriate end for the cradle. However, I so see a 3rd party company that sells one. Is anyone using this setup? Thank you, Art