Conference microphone 1.polar pattern: hart-style 2.sensitivity:-47+_2dB 3.60Hz-15KHz . goose neck conference microphone Functions1. Built-in speaker, playing conference background music is allowed2, When open microphone or insert earphone,the speaker closed automatically3. Using HI-FI unidirectional capacitance sound head, latest electrocircuit design, VF encryption, multiple noise monitor ...