Working voltage of 12V ensures compatibility with various car audio systems. Designed specifically for XF and models for seamless integration. Converts external audio signals to optical fiber signals for high-quality sound transmission. Installation location is behind the car audio screen host or car power amplifier for easy access. Optical fiber communication ensures reliable audio performance, even when replacing the car screen host or retaining the car amplifier. If there is no sound after installing the fiber optic box, please check the following steps: 1. Confirm whether the power supply is connected well, measure with a multimeter, yellow --- battery power 12V, black --- ground wire, no need to connect ACC power supply. 2. Confirm whether the gateway signal is connected well, CAN-H, CAN-L. 3. In the optical fiber communication of the vehicle, all the optical fiber signals must be to communicate normally. Due to the damage of certain electrical equipment of the vehicle, the optical fiber communication is abnormal. At this time, it is necessary to short-circuit the optical fiber signal of the damaged device, (common For example: 6-disc CD, telephone communication module, or directly install the optical fiber audio box to the car amplifier). Color: Blue Material: plastic Package Contents: 1 * Fiber Decoder Box 1 * Audio Power Cord