1.The mircophone has the long life and no noise of touch ON/OFF swith.  Annular red indicator lamp can show the working state on microphone.
   2.The chairman unit can turn down the delegate for anytime by priority  button.
   3.Built-in high fidelity speak for meeting amplifying and playing  background music. Specification of speakers: 8 Ω 2 w Ф 60;
   4.The unit comes with 2.1M 8P shielding wire, which greatly reduces the  interference of electromagnetic wave to wire
   5.The speaking model:FIFO/LIMIT/FREE.