MEO-618PN-02-643 - 

Microphone, -60 dB to -74 dB sensitivity

These INTERVOX® microphones are highly efficient and are especially designed for telecommunications, computers, intercoms, teleconferencing, hearing aids, security, speech recognition, recording equipment, modems, and many other applications.
100 Hz to 12000 Hz to 20 Hz to 16000 Hz frequency range. 0.3 mA (Max.) to 0.8 mA (Max.) current rating.