Install Audio AUX Cable and activate with Diagbox (PP2000 or Lexia) on Peugeot Citroen RD4 Radio CD - YouTube
RD4 Upgrade RD45 Car Radio Player Screen USB AUX Microphone for Peugeot Citroën | eBay
Stroking Car Radio RD4 AUX-in Bluetooth 5.0 Music Adapter Full Harness Cable Fit For Peugeot 307 308 407 408 507 For Citroen C2 C5 (Color Name : Harness bluetooth) : Amazon.co.uk: Electronics & Photo