uxcell Travel Microphone for PC Notebook Computer Frequency range: 20-16.000Hz; Impedance: 2.0K. Maximum power input: 0.4ma; Sensitivity: -47dB.0dB=1V/Pa at 1Khz. Lengh: ~12.3cm; Weight: 25g. Adjustable Notebook Microphone boom pivots and holds ideal position.