?Reliable Service?Ready to respond within a 24 hour time frame. 30-Day money back guarantee, 12 month replacement and lifetime Support. ?Product Dimensions? 6.4 x 4.3 x2.5 cm/2.52 x 1.7 x 0.98 inch. The shell made by metal, reliable and strong. ?How to connect?Input Ports: white for right channel, red for left channel. Output Ports: white for right channel, red for left channel. ?Application Scenario?This audio noise isolator is especially useful when your car is equipped with a power amplifier or subwoofer. Also works on that there are noises when the car accelerates, the higher the speed, the louder the noises. ?PLEASE NOTE: If you are not sure about a compatible device, please contact us before purchg?Eliminates DC Current from the car audio RCA input. Eliminates ground loop noise from radio pre-amp outputs. Reduces most noise in your RCA signal path. The audio noise isolator's metal shell creates a shield from ground noises to electromagnetic signals.