The acoustoelectric conversion principle can be divided into: dynamic (moving coil, aluminum tape), capacitance (dc polarization), piezoelectric (crystal type, ceramic type), and magnetic, carbon type and semiconductor type, etc.

        According to sound field force is divided into: pressure, differential pressure type, composite column, line type, etc.

        According to the electric signal transmission mode can be divided into: wired and wireless.

       Can be divided into: according to the use measurement microphone, vocal microphone, instrument microphone, audio receiver, etc.

        According to the directivity is divided into: heart-shaped, sharp mind, heart, two-way (8), no point to (omnidirectional).

       Electret microphone volume is small, cheap, widely used in the telephone, mobile phones and other equipment.

        Based on silicon micro microphone CMOSMEMS technology, smaller. Its consistency will be better than the consistency of electret condenser microphone more than 4 times, so the MEMS microphone is especially suitable for cost-effective microphone arrays, among them, to be a better match of the microphone will improve acoustic formation and lower noise.

        Laser microphone used in hacking.