Product function: used with most external optical fiber amplifiers (audio gateways). When adding aftermarket audio units, this module can the for original amplifier, speakers and sound quality.Processor function: used to upgrade for -/for car audio units.Compatible: used for - unit replacement interfaceCompatible: for unit (PCM2, 2.5) replacement interfaceName:Optical fiber audio decoding boxWorking voltage:12VApplicable car series:For - ML//R class 2005-2012For - /E/ class 2009-2012For 2005-2011For 997/911 2005-2011For 718 2005-2011Colour:BlackMaterial:PlasticPackage Contents:1 x Fiber Decoder Box1 x CableOnly the above package content, other products are not included.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.