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Biurlink 5Pcs Car Aux Input Adapter RCA Cable For Kenwood Radio CD Player|car aux input|aux inputaux input adapter - AliExpress
13-Pin Car Bluetooth Module Music Wireless Adapter Stereo Auxiliary Receiver Aux Audio Cable Compatible with Kenwood CA-C2AX KCA-iP500 CA-C1AX KRC-553 | 12V | Keple.com
Car Bluetooth Module Aux Cable Adapter for KENWOOD 13Pin interface Radio Stereo Wireless Audio Input | Wish
Aux cable option to car stereo - Electrical Engineering Stack Exchange