Monoprice 100650 25-Feet 3.5mm Stereo Plug/Jack M/F Cable, Black (Discontinued by Manufacturer) 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 one end and a female stereo (TRS) jack on the other end each with molded connector housings and strain relief boots The cable is ideal for extending the reach of a fixed length 3. 5mm stereo cable such as the cable on a pair of earphones