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Pay attention: when you connect the cable, you find that the sound is abnormal. Please note that this is not a problem with our fiber conversion module. because the vehicle's fiber communication system cannot communicate normally. If there is no sound after installing the fiber optic box,Pls check it as following steps: 1: Confirm whether the power supply is connected well, measure with a multimeter, yellow --- battery power 12V, red --- ACC power supply 12V, black --- ground wire 2: Make sure the power supply is connected, check whether the red light at the fiber interface of the fiber box is on and blinking 3: In the optical fiber communication of the vehicle, all optical fiber signals must be able to communicate normally. Due to the damage of certain electrical equipment of the vehicle, the optical fiber communication is abnormal. At this time, the optical fiber signal of the damaged device needs to be short-circuited, Common examples are: 6-disc CD, telephone communication module, or directly install the optical fiber audio box to the car's power amplifier, so that the car's power amplifier can communicate with the optical fiber audio box normally. 4: The W164 power amplifier is located under the seat of the driver, the Porsche Cayenne's power is placed on the right side of the car's trunk, and the Porsche Cayman's power is placed under the car's co-driver's seat. Product name: Optical Fiber Audio Decoding Box Working voltage: 12V Applicable models:for Benz ML/GL(W164) R(w251) SLK(with SD card slot) Wiring method: yellow----B+ battery positive electrode, red----ACC power supply positive electrode, black---GND ground wire Installation location: Behind the vehicle audio screen host, or vehicle 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. Colour:Black Material:plastic Package Contents: 1 set * Optical Fiber Decoder Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.