3.5mm Stereo Plug to Jack Extension Cable Male To Female. 3.5 mm audio extension cable makes hard to reach places accessible Extend computer speakers or headphone cables This headphone extension cable can extend your devices with 3.5mm jack to the desired location for audio . It can easily extend the connection between your MP3 players, smartphones, tablet or any other 3.5mm aux port equipped devices to your headphone, earphone, speaker, car stereo or home theater system, etc.