This product has a fully automatic detection of the scene whistling point function, four into one out, through the DSP system for sound filtering, bass compensation automatic mixing, intelligent high-speed feedback processing; full digital maximum elimination of the return transmission, when using multiple microphones at the same time, automatically adapted to the acoustic environment, no need for debugging, fast correction function, to ensure that the sound quality, to reduce the delay, to prevent the peak input distortion, and effectively increase the microphone pickup distance 30~100cm.

* Signal output 1~4 level indicator and volume adjustment potentiometer;
* Signal input level indicator, if the level lamps are all lit and turn red, it means the input level signal is overloaded;
* Calibration switch (non-locked switch), press 5 and then release, calibrate lights up, indicating that it is in the calibration state, the whole process is about 5 seconds.
The whole process takes about 5 seconds;
* Bypass/working switch, green light indicates working status. Red light indicates bypass status;