Driver diameter: 50mm Impedance: 20 Ohm Sensitivity: 117dB +/- 3dB Frequency range: 20-20KHz Mic dimension: 6.0 * 2.7 mm Mic sensitivity: -34dB +/- 3dB Mic impedance: 2.2k ohm Directivity: Omnidirectional Working current: Below 100mA Headset interface: USB (plug the USB connector, LED light is on, unplug, it off) + 3.5mm stere