Features: In the optical fiber communication of the vehicle, all the optical fiber signals must be ableto communicate normally. Due to the damage of certain electrical equipment of the vehicle, the optical fiber communication is abnormal. At this-ime, it is necessary to short-circuit theoptical fiber signal of the damaged device. 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. No need to connect 6 meter long cables from front to the car trunk. Make installation easy, plug & play. Specifications: Material:Plastic Size:As Picture Shown Color:Blue For ML R E8X E9X E7X F0X 2G HOST/3G-HOST Working voltage: 12V Connector type: audio-output Installation location: behind the car audio-screen or behind the car power amplifier. Package Includes: 1 Set Optical Fiber Decoder Most Box note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.