Apply PLL frequency synthesis phase-locked loop technology to avoid interference frequency ; CPU bus control, with digital LCD interface display, free operation and outstanding performance; Multi-stage narrow-band high-frequency and intermediate-frequency selective filtering to fully eliminate interference signals; Audio compression-expansion technology greatly reduces noise and increases dynamic range; The feedback howling suppression and weakening function can effectively reduce the feedback howling; The receiver adopts multi-stage high frequency amplification, which has extremely high sensitivity; Multiple noise monitoring circuits and a special ID identification code verification system make it super anti-interference;Ideal space use range of 80 meters.