... sound,Unilateral Line Design,using lightweight, high-rigid material for it. Headphone:A special steel beam design, not easy to impairment;High-fidelity speakers, sound quality ... and transparency;Unilateral line design to avoid the line windingUsing lightweight, high-rigid material Mic ... )100dB±3dBCord Length 2.2metersNet Weight 120g V40 Headphone