This application, can determine the total noise level, and be used as a spectrum analyzer for the microphone signal. Rate the quality of the microphone bandwidth of your device, using a spectrum analyzer. Determine the dynamic range of the sound in different frequency bands. It can be used as a VU-meter in FAST mode and as a RMS-meter in SLOW mode time weighting. Available user equalizer, for microphone calibration to get more accurate results. Support bluetooth handsfree microphone. This