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 gold-plated 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.This cable features a retractable spool housing. The cable extends to several fixed lengths up to a maximum of about 2.5 feet. A gentle tug on the cable at maximum extension activates the retraction mechanism, which pulls the cable into the housing and wraps it neatly around a spool. You won't have to worry about tangled cables or damage to an exposed cable.*** 30-day easy returns. No restocking fee. Free lifetime technical support. Limited lifetime warranty. ***