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1,Can detect the surrounding sound then output analog value 2,Can set a sound value then output digital value 3,Adjustable Sensitivity , Stable Performance 4,5V Working Voltage , support both the output digital value and the output analog value 5,Analog voltage signal output, signal amplitude is VCC / 2 6,Sensitivity, built-in amplifier circuit, gain can be adjusted 7、Get the intensity of the sound of the voltage signal through the AD transform 8,Port explanation : DO for digital output, AO for analog output 9、Applicable to a variety of platforms including Arduino / AVR / ARM