Features: 1.4-channel audio high to low, fast heat dissipation, anti-interference, strong shielding, can isolate some noise, high fidelity. 2.Standard connector, equipped with 15CM dedicated line, to avoid current noise interference caused by disorderly wiring. 3.Convert the loudspeaker output high frequency to low frequency (RCA) output, connect the car power amplifier or subwoofer signal output. 4.Delay switch line output, reduce the impact of the power amplifier or subwoofer, thereby eliminating the current interference of the power amplifier speaker when the host is turned on. 5.Used for hosts without low frequency (RCA) output, such as cassette player/card player/CD/VCD/DVD, etc. Specification: Item Type: Audio Converter Material: Plastic Voltage: 12V Maximum Power: 50W Channel: 4 CH Size (W x L x T): Approx. 80 x 90 x 30mm/3.1 x 3.5 x 1.2in How to Use: 1. Connect the power cable to the converter wire harness and connect the car to the other end of the main engine. The other end of the two car audio cable connected to the car audio amplifier. 2. Product packaging with complete wiring instructions and product use methods. Wiring: White line - rear left horn- Gray line - rear right speaker+ Gray black line - rear right speaker White and black line - rear left speaker- Green and black line - front left speaker- Blue line - front right speaker+ Green line - front left speaker+ Blue and black line - front right speaker+ Red line +12V (ACC) Black wire - connect to negative ground Yellow line - power amplifier REM position