Style: On-the-Head Product name: Stereo Headset Frequency Response: 20 Hz ~ 20 KHz Nominal Impedance: 32 ohms Microphone Sensitivity: - 58 db Sensitivity: 105 dB ± 3dB (at 1000 Hz ) Speaker Diameter: F40 mm Earphone / Microphone Plug: 3.5 mm Stereo Controller: Volume knob on the headset