Wired USB onear headset. 2 x 30mm diameter speakers. Impedance: 150 ohms. Sensitivity: 100dB +/ 3dB. Frequency range: 100 to 6600 Hz. 1 x unidirectional microphone, ideal for voice capture. Sensitivity: 40 3 dB 0dB = 1V/Pa, 1KHz. Frequency range: 100 to 10000 Hz. Microphone type: Cardioid.