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The board comes with a 20-20KHz electret microphone soldered on Using the MAX4466, an op-amp specifically designed for amplifier For the best performance, use the "quietest" supply available (on an for Arduino, this would be the 3.3V supply) The amplifier has excellent power supply noise rejection This breakout board is best used for projects such as voice changers, audio recordingmpling, and audio-reactive projects that use FFT