Product function: used to equip with external m.o.s.t. optical fiber amplifier (audio gateway), when adding aftermarket audio head unit, this module guarantees factory amplifier, speaker and sound quality.<br> Processor function: used to upgrade Mercedes-Benz/Porsche car audio head unit.<br> Compatible with: for Mercedes-Benz head unit replacement interface<br> Compatible with: Porsche head unit (PCM2, 2.5) replacement interface)<br> Name:Optical Fiber Audio Decoding Box<br> Working voltage:12V<br> Applicable car series:<br> For Benz ML/GL/R class 2005-2012<br> For Benz CLS/E/SLK Class 2009-2012<br> For Porsche Cayenne 2005-2011<br> For Porsche Cayman 997/911 2005-2011<br> For Porsche Boxster 718 2005 - 2011<br> Material: ABS<br> colour: black<br> Package Contents:<br> 1 x Fiber Decoder Box<br> 1 x Cable<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.