Luejnbogty Name:Optical Fiber Audio Decoding Box Working voltage:12V Applicable models: For vehicles For 2000-2003 S/ class For 2000-2002 E Class For 2003-2004 SL For 2001-2004 C/CLK For 2000-2005 ML Installation location: Behind the car audio screen host, or car power amplifier. Function: Convert external RCA audio signal to optical fiber signal, and transmit to the car amplifier through optical fiber. The sound came from the sound of the car. For example: For E Class Carton audio, when you need toreplace the car screen host, in order to retain the car amplifier, you canc. Colour: blue Material: ABS Package Contents: 1 * Fiber Decoder Box 1 * Cable Only the above package content, other products are not included. Note: Light 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.