... meeting room,public security organs, procuratorial organs... E.TRADIO: Clear Speech Microphone,Omni Directional, Monitor Range 10-50sq.m,Size 90mm ... 90mm × 35mmWeight 66g Detail Introduction: *Low noise, Low echo, clear speech, medium price.*blue/white coat microphone,widely voice-picking region ... department.*According with CE standard. E.TRADIO High-Fidelity,clear speech audio surveillance microphone