Complete kit for retrofitting a rear parking aid system (APS) for Audi A4 Cabrio 8H This kit converts an APS into an APS plus system with acoustic support (no optical display possible) Better estimation of the distance to obstacles thanks to the individual response of each sensor Scope of delivery: Wiring Control box Sensors Buzzer Switch for center console Note: This kit is only intended for retrofitting cars that are already equipped with original Audi rear parking sensors. (7X1) We will carry out this retrofit for your car. Please do not hesitate to contact us!