Feature: 1. Replacement Audio Cable: Replace the headphone extension cable, compatible for HD660s HD650 HD600 HD580 and other earphones, maximizing the effect of earphones and more functional applications. 2. Plug and Play: Its jack is 3.5mm male and 6.35mm adapter, you can use it when you connect the headset device. The length can be stretched, about 1.8 meters in the unstretched state, and about 5 meters in the straightened state. 3. Intelligent Noise Reduction: The twisted pair twists the hot and cold signal wires to offset the magnetic flux caused by the current and reduce signal transmission loss. Through the connection line to reduce the current noise, and achieve high definition sound. 4. Highly Restored Sound Quality: OFC copper wire can improve the resolution and separation of earphones, and eliminate the dim feeling of earphone bass. Make the sound clearer, restore the real sound, and let you have a different listening experience. 5. Excellent Signal Transmission: The optimized core structure is adopted, the resolution is improved, the sound is transparent and smooth, and more layered; the middle frequency is moist and the human voice is magnetic; the low frequency is full and powerful. Specification: Item Type: Headphone Audio Cable Applicable Models: For HD660s HD650 HD600 HD580 and other Headsets Wire Material: Oxygen Free Copper Wire Core Material: Bare Copper Wire Wire Length: About 1.8m /5.9ft in the unstretched state, up to about 5m / 16.4in in the straightened state.. Package List: 1 x Headphone Cable1 x 6.35mm Adapter