Monoprice 109564 Coiled 3-Feet 3.5mm Male to 3.5mm Male Stereo Audio Cable, Black The 3.5mm (1/8") stereo TRS connector is more commonly known as the Headphone Jack on portable mp3 players and mobile phones This cable has a gold plated male 3.5mm stereo (TRS) plug on each end and features ultra-slim connector heads The cable is ideal for connecting a stereo audio output such as an mp3 player or phone to a stereo audio input such as the auxiliary input on a car stereo system