This harness provides a line out converter for connecting a set of RCA cables to carry the audio signal to an external amplifier. The remote amplifier on the harness is also pre-installed on the harness. This wire goes with a set of RCA cables to your aftermarket amp.All you're left to do is connect your own battery mains and ground. Compatibility Note: The volume of the amplifier can be adjusted by the knob on the wiring harness. For example, if it is installed in a "premium audio" system, the wiring harness may need to be connected to the amplifier rather than directly to the radio. The remote wires from the wiring harness can use wires of various colors. Regardless of the color, don't worry, it is for turning on the amp remotely. Model name: Converter Adjustment instructions: After completing all necessary connections, turn the adjustment potentiometer counterclockwise to the end. Turn on the sound system and turn the master volume control on the sound to about 3/4 of the maximum volume. Select one of the adjustment knobs and turn it slowly clockwise until you notice audio distortion, then turn the remaining knob to the previous position Adjustment Potentiometer Color: as picture shown Material: plastic Package Included: 1*Car Plug and Play with Wiring Harness Note:1. Please allow slight errors due to manual measurement. Please make sure you do not mind before bidding.2. Due to different monitors, the color may vary, please understand. Note:Hello, please pay attention to your shipping address when purchasing the product. If your receiving information (eg: name, street, house number, doorbell/email with no name, etc.) is incorrect, the order will not be delivered correctly.