New Genuine OEM Stax extension cord 2.5 meters or 8.2 feet. Works with any 5-pin Stax Headphones. I have Seven of these and sold one on March 4, 2023 and another on April 28, 2023. Provides greater range of area for headphones use. Considering the length of the hang of the headphones while wearing them, the extension cord more than DOUBLES the distance in which you can sit away from the music source and other equipment, enabling a greater comfort zone. Helps to protect cable damage and headphone damage due to headphone cable getting snagged during use. In other words - the extension cord should disengage from the headphone cable before the headphone cable connection to the headphone is damaged. THE SOUND TRANSMISSION IS NOT AFFECTED BY THE LONGER CABLE. This is due to the (OEM) Stax extension cable being constructed with the same or better material and technology as the (OEM) Stax headphone cable. HiFC cable, which has already been used in some STAX ear speakers, has been adopted as the wire material. HiFC is a registered trademark of high-performance pure copper wire developed by Hitachi Metals. It is a material that enables continuous casting by adding a small amount of titanium to copper to control impurities in the copper. It has excellent durability for less. In terms of sound quality, it faithfully reproduces low to high frequencies, and has a well-balanced sound quality that is extremely natural with little coloring. Need even greater range? Yes, you may add two OEM cords totaling 16.4 feet for even greater range without loss of frequency or volume. Let me know the quantity you need.