1、COMPATIBLE MODELS: Headphone AUX sound cord is compatible with for WH 1000XM5 4 3 2, for WH XB910N XB 950BT 900N 700, for MDR 1A MDR 100abn MSR7 1rmk2 100AAP, for ATH, for MSR7 series and more.  2、WITH MICROPHONE: Replacement headphone upgrade cord with mic for microphone and volume control. Has the function of eliminating the skin effect that affects the high frequency transmission of sound generated.  3、PLUG AND PLAY: Headphone upgrade cable is suitable for cell phones, MP3, MP4, for iphone and other devices with 5mm jack. Connector 5mm to 5mm, plug and play for a different listening experience.  4、OXYGEN FREE COPPER WIRE: Replacement headphone upgrade cord is made of oxygen free copper wire with excellent sound transmission, lower noise and clearer sound. Improved headphone resolution and separation.  5、REDUCES NOISE: Reduces the effects of current noise caused by external magnetic flux through the connecting cable for a more natural and beautiful sound, effectively preventing the stethoscope effect. 6、GOLD PLATED PLUG: Headphone upgrade cord is perfect as a spare or replacement for damaged or lost cables. Resistant to pulling and more durable. Plugs are gold plated and resistant to plugging in and rusting.