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.