Type: Headphone; Speaker Diameter: 40mm; Sensitivity: 97dB (tolerance: 3dB); Frequency Response: 5Hz-25, 000Hz; Impedance: 50ohm; Rated Power: 15mW; Power Capability: 200mW; Cable Length: 2.2M add 0.3M; Plug Type: Stereo diameter: 3.5MM Notes: 1)The headphone utilizes high grade3 coiled Oxygen-free for speedy transfer with minimal loss; 2)The individual design of telescopic mic offers you neat and easy storage. With Mic Mic unit manufactured in dust-free workshop and the the use of noise-proof spiral shield wire, the handphone can actively attenuate ambient noise for passionate music world; 3)Popular with urban young people and can bring you into a passionate music world; 4)Adopt 40mm(diameter) Neodymium magnet driver unit, which can have a perfect performance from undertone to alt; 5) All raw materials including working process complies with EU ROHS directive. And we can provide relative test report issued by authority, which ensure a safe secure use.