Professional Noise cancelling electret microphone

1.The description of  Electret condenser microphone :

Electret condenser microphone is a sound- electrical conversion device. The Electronic condenser microphone is used in  telephones, wireless telephones, mobile phones, ear-telephones, PCs, language-learning recorders, radio recorders, cassette recorders, alarms, voice control toys, voice control switches and  so on .

2.The specification of Electret condenser microphone :

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 5.Internal and Test circuit for Mics:

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