Heavy duty 6? non-tangle wire. The instructions are terrible. They don?t latch right into the door so they move around a lot and actually damage the top of my door frame. I used the product for the noise canceling feature at night and for phone calls mostly. Regreso a Adidas no se porque pensé en esta opción totalmente arrepentido. The screen bulged near home button. Other than that, they are nearly identical. 2 BLE turn off when not played for a certain interval of time. The shoe is cute though. My last Bose Acoustic system was purchased in 1994.