These sport earphones , have a better sound quality, cooperate to the CVC digital noise reduction technology, effectually reduce interference of the background sounds. It has a gold-plated jack contact surface to prevent oxidation, reduces signal loss, and provides better audio restoration. 32 core long crygen oxygen-free copper cable, audio signal transmit without loss. Perfectly restore the sound scene and rich details. The ED3 headphones with high end material make the perfect stereo. Lighter, reducing the burden of wearing. Comfortable to wear for long time, will not cause discomfort. The headphone with better noise isolation.