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ELIMINATE NOISE -- H-density, lo-level wound torroid choke will eliminate ground loop noise between the audio source or audio amplifier. Keep a clear listening environment for you. FUNCTION – It can reduce the noise in the audio system and reduce eliminates engine interference. WIRES FEATURE -- Red wire for input, blue wire for output and black wire is ground wire. EASY TO INSTALL -- Just splice the red wire to the line of 12V input, splice the blue one to the positive line, splice the black one to the ground wire. SUITABLE ELECTRONICS – It is suitable for car audio, radio, amplifier stereo receivers, equalizers, and other mobile electronics.