Speaker Size : 50mmImpedance : 16Sensitivity : 105Frequency range : 15 HzMicrophone : 6.0*5.0Microphone sensitivity:-38Microphone impedance : 2.2KDirectionality : omni-directionalCable length : 2.1 MLED working voltage : DC5VWorking current : 500Headset jack : USB + 3.5 MM