Microphone sensitivity: -42dB ± 3dB Speaker sensitivity: 100dB ± 3dB Frequency response range: 20Hz ~ 20KHz Interface: 3.5mm, 4 poles Cable length: about 1.5m Item size: 16.45 * 15.3 * 5.82cm /6.48 * 6.02 * 2.29in