This is the cable to connect the iPhone phone cradle to the Mercedes iPod kit.
This version is for E (W211), CLS (W219), SLK (R171) and NTG2.5 (MY2009) cars (A/B/CLC/W211-E/CLS/ML/GL/R).
It is not suitable for pre MY2009 A/B/CLC/W211-E/CLS/ML/GL/R or the W204-C, W207-E Coupe & W212 E class ipod kits.
It replaces the exising iPod connection lead, thus it is no longer possible to connect an iPod, you must use the iPhone.