Specifications:
1) Sensitivity (0dB=1V/Pa, 1,000Hz): -32±2dB, -34±2dB,
    -36±2dB, -38±2dB, -40±2dB, -42±2dB, -44±2dB, -46±2dB 
2) The sensitivity of "Pa" will increase 20dB of ubar, for example, -60dB
    (0dB=1V/ubar)=-40dB (0dB=1V/Pa)
3) Frequency range: 20 - 20,000Hz
4) Directivity: omni-directional
5) Impedance: ≤2.2kΩ
6) Current consumption (max.): 500uA
7) Standard operation voltage: 4.5V
8) Max. operation voltage: 10V
9) Sensitivity reduction: within -3dB at 1.5V
10) S/N ratio: >60dB
11) Dimensions (Φ x H): 4.5 x 2.2mm