1.The unit has built-in the MCU control circuit,it can   realizedigital management.
2.The microphone unit has built-in high fidelity of capacitor sound head,   its sound quality is clear and  low   noise,it has strong pickup distance.
3.The meeting model:FIFO/LIMIT/FREE.
4.The chairman unit can turn down the delegate for anytime by priority   button.
5.The annular blue indicator lamp can show the working state on   microphone.