The KNW-AUX is a current sensing device that will automatically interrupt the audio lines coming from the Kenwood CD changer (and switch in an external RCA signal) whenever an audio signal is detected on its RCA inputs. The audio lines will reconnect to their previous state 10 seconds after no audio signal is detected by the KNW-AUX on its RCA inputs. --- The Kenwood CD changer function is maintained by connecting the CD changer data cable to the input on the KWN-AUX.