Specification:
1. microphone sensitivity: - 58dB & Plusmn; 3dB
2. microphone directivity: noise cancellation
3. microphone impedance: 2.2k & omega;
4. sensitivity reduction: inside -3dB at 1V
5. frequency response: 20-16,000Hz
6. standard operating voltage: 1.5V
7. cable length: 1.5 meters
8. plug type: 3.5mm stereo