*The unique isotropic double moving coil technology, 4 speakers with the same time sound, so that the sound quality is more on a higher level.*Acoustic noise reduction design, in order to prevent sound leakage of the headset, we have specially designed a sound leakage metal back cover, quietly enjoy the good sound quality* Cable using Kevlar, this material is used for bulletproof vest fibre can help headphones better resistance to tugging and prolong the life of the headset