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 features a male 3.5mm stereo (TRS) plug on each end, with molded connector housings and strain relief boots. 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.