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  * Pickup mode: full range
  * Directivity: Back-polarity
  * Frequency response: 20Hz-20KHz
  * Impedance: 250 30% (1000Hz
  * Sensitive: -63dB + 3dB (0dB = 1 V / microbar 1000Hz means open circuit)
  * Operating voltage: DC 9V-52V

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