1.The unit has built-in the MCU control circuit,it can   realizedigital management,it has voting(three key) and video auto-tracking   functions.
2.It uses the environmentally protection, low power consumption and  seal of touch switch.
3.The ON/OFF state, dynamic level and    volume of microphone can show on the LCD.
4.It uses the electronic code of switch to adjust the volume.
5.The microphone unit has built-in high fidelity of capacitor sound head,   its sound quanlity is clear and low noise,it has strong pickup distance and   it has suppression the howling function.
6.The unit has built-in speaker and headphone jack,it can play background   music and expansion the voice.