Grandstream GUV3000, HD USB Headsets with Noise Canceling Mic (GUV3000) Connection Type - USB 2.0 Wearing Style - djustable headband Speaker Diameter - 27mm Impedance - 150(±15%)Ω Sensitivity - 95±3dB (at 1kHz 1mW) Frequency Response - 100Hz~7kHz Distortion Max: - 3% & 1kHz Default Input Power - 10mW Maximum Input Power - 20mW L/R Volume Level Difference Average - ≤3dB (at 1kHz 1mW) Microphone Dimension - Φ4.0*2.2 mm Output Impedance - <2.2 kΩ Sensitivity - -47±3dB f=1kHz,Pin=1 Pa Frequency Response - 150Hz~6.8kHz Directivity - Cardioid Microphone Boom Arm Rotation - 310˚ Busy-Light - No Application Compatibility - Support popular communication applications (such as Zoom, Teams, Slack, WebEx, IPVideoTalk, Grandstream Wave, Counterpath, 3CX soft phones) and IP phone devices Cable Length - 2 meters Weight - 125g