Allows easy access to factory radios with built-in rear speaker outputsPlugs directly into empty 35 pin socket on 06-13 factory Harmon Kardon radiosWires are clearly labelled for easy installationThis plug accesses the speaker leads of the radio but does not activate your radio's built-in fader control. To have your fader enables, you must go to a H-D® dealer and have your radio ''reflashed.''