Connect cable to mp3 jack for Peugeot Citroen on RD4 car radio - YouTube
Car DMC Bluetooth Hands Free A2DP USB Drive AUX Adapter for Peugeot RD4 3 2 1 Blaupunkt Radio MP3 Audio CD Changer for Citroen - AliExpress
Autoradio rd4 Peugeot Citroën - Équipement auto
BLAUPUNKT CLASS 1 RD4 N1 MP3-02 9662925977 96629259XT 657931 NFP 657930 RP 1614201480 EJ
Car Audio Bluetooth 5.0 Receiver Aux Adapter For Peugeot Citroen C2 C5 Rd45 Rd4 Radio Module Bluetooth Aux Cable - Car Audio Accessories/car Stereo Accessories - AliExpress