While most mobile devices use the 3.5mm stereo headphone output, most home audio systems with an amplifier or receiver use RCA jacks for audio inputs. This cable is ideal for connecting the output of your MP3 player or phone to your home audio system. The cable is made of heavy-duty coaxial cable for each conductor. The conductors are 22AWG and each conductor is shielded to prevent EMI or RFI interference from entering your audio system.