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Package Included 1 x Wired Headphone with Built-in Microphone Specifications: Driver diameter: 40mm Impedance: 32Ohm±15% Sensitivity: 105dB +/- 3dB at 1KHz Frequency range: 15Hz-20KHz Mic dimension: 6.0 * 5.0mm Mic sensitivity: -38dB +/- 3dB Mic impedance: 2.2kohm Directivity: All directional Cable length: Approx. 2.1m±0.15 LED working voltage: DC5V +/- 5% Working current: Below 100mA. Headset interface: 3.5mm(4pin) + USB (USB for LED light) Color: Black-red, Black-blue Headphone size: Approx.95*215*205mm/3.7*8.5*8.1in Headphone weight: 298g / 10.5oz Package size:213*200*105mm/8.4*7.9*4.1in Package weight: 423g / 0.9Lbs Frequency: 20-20KHz