... ,public security organs, procuratorial organs... E.TRADIO: Clear Speech Microphone,Omni Directional, Monitor Range 10-50sq.m,Size ... 66g Detail Introduction: *Low noise, Low echo, clear speech, medium price.*blue/white coat microphone,widely voice-picking region ... Built-in over-loading protection and lightning proof circuit.*Pre-amplifier, directly drive DVR, VCR, headphone, loudspeaker etc.*Excellent ...