... room, visitation room,classroom Flat Style Microphone,Omni Directional, Monitor Range 10-40sq.m,Size 95mm*95mm*30mm, Weight ... × 95mm× 30mmWeight 80gStandard CE FCC Detail Introduction:*Professional wired audio surveillance & monitoring microphone.*High Fidelity , High sensitivity ,Low ... noise, Low echo, clear speech*Built in digital audio disposal circuit , two step dynamic de-noise disposal.*Special ...