3.5mm audio extension cable extends the connection between your MP3 players, smarphones, tablet or any other 3.5mm aux port equipped devices to your headphone, earphone, speaker, car stereo or home theater system etc. headphone cable extension oxygen-free copper core Which could provide maximum's conductivity and durability and transfer high purity audio signal without distortion,high fidelity,ideal for music lovers durable-braided cord& ladder desisn With a tested 15000 bend lifespan, double-braided nylon audio cables adding to the durability and tangle free. （friendly reminder） If you use TRRS headphones (4-conductor) with this Aux cable, the audio will work but the Mic won't.It also does NOT work with the inline volume control on the headphone.