1. It using long service life and no noise of touch switch.
2. The microphone unit has built-in high fidelity of capacitor sound head,   its sound quality is good and low noise,it has strong pickup distance.
3. It with the inhibiting noise of function.
4. The annular red indicator lamp can show the working state on the   microphone.
5. The meeting model:FIFO/LIMIT/FREE.
6. The chairman unit can turn down the delegate unit by priority button.   
7.The base of material using the metal to die-casting, so it more sedate   and easy.