Features for USB headphone: 1.comfortable leather foam headband 2.Adjustable,bendable and pivotable microphone 3. Powerful bass-driver stereo sound 4.Eye-catching LED in ear cap 5.USB sound card Specifications: Driver Unit: 40mm Frequency response: 20~20Khz Sensitivity: 118±3dB Impedance: 32 ohm Max imput power: 40mw Mic frequency range: 20^20khz Mic sensitivity: -58±3dB Cord length: 2.1m