1.Built-in   single chip computer control circuit and adopt PVC thin film switch.
    2.It has three key votes, voting function.
    3.The LCD screen shows microphone ON/OFF condition and control dynamic   level and volume.
    4.Built-in hi-fi speaker 8 Ω 2 w Ф 60 mm, for conference room amplification   and play the background music, electronic switch control volume.
    5.Built-in winfprooy sponge and  high   fidelity condenser cartridge, which makes sound reduction, high resolution   and low noise.
    6.The annular red indicator lamp can show the working state on   microphone.
    7.The chairman unit can turn down the delegate for anytime by priority   button.
    8.The unit has equipped with the2.1M 8P aluminum aluminum foil network   shielding wire.
    9.The speaking model:FIFO/LIMIT/FREE/CHAIRMAN.