For Android DVD Plug and play, easy and convenient installation. Connect the B+ cable (in yellow) and GND cable (in black) to the corresponding cables (in same color) from the power cable. If your car uses optical fiber audio signal ( auto), please be to buy the corresponding optical fiber box, then you need buy the "optical Fiber box" . Compatible Fiber-Optic Interface: When installing this interface into your car, you must make that the Fiber-Optic signal loop is not broken. If you have other devices which can include CD Changer, satellite radio, and telephone module, they must stay connected so the fiber optic signal loop is consistent. To identify if you have a Fiber-Optic MOST factory-amplified audio system, you can check the vehicle in the following ways: Some vehicles will have clear markings on the speaker grills indicating the presence of an upgraded audio system. You can also check with the order notes/invoice from when the car was purchased from the factory, the upgraded with an amplifier would show on the list. Compatible Car Models: for Class (2009-2012) /SL/ Class 2005-2008 E-Class W211 W219 2003-2008 /S Class W220 2004-2006 Model Name:Optical Fiber Box Out Power:Standard Interface:AV-Out Voltage:12V Item Type:Cables, Adapters & Sockets Special Features:Car Radio Adapter Fiber Box Application:Amplifier / Speaker Connector Type:Audio output color:Blue Material:ABS Package Contents: 1 x Fiber-Optic(MOST) Decoder Box 1 and AUX Audio Input Connection 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.