1. If your car has a factory Harman/Kardon premium sound system, be sure to purchase the matching fiber optic box for your model.

2. Compatible with the following models:

Fiber optic box A:

• Mercedes-Benz R-Class 2005-2018
• Mercedes-Benz ML 2005-2011
• Mercedes-Benz GL 2005-2013
• Mercedes-Benz CLS 2009-2012
• Mercedes-Benz S W221 2005-2012
• Mercedes-Benz SLK 2009-2012
• Porsche Cayenne 2004-2015

Fiber optic box B:

• Mercedes-Benz CLS 2005-2008
• Mercedes-Benz E 2003-2008
• Mercedes-Benz S 2004-2006
• Mercedes-Benz SLK 2004-2010
• Mercedes-Benz CL 2004-2006

3. Connection method:
Connect the yellow B+ wire and the black GND wire to the corresponding wires (in the same color) of the power cable.

4. After installing the fiber optic box, the radio will not support equalizer adjustment.