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Quantity:1pc Structural principle: 1.Piezo buzzer mainly by multivibrator, piezo buzzer , impedance matching and resonance box , casing and other components. Some piezo buzzer case is equipped with light-emitting diodes. 2.Multivibrator constituted by the transistors or integrated circuits . When switched on (1.5 ~ 15V DC working voltage ) , multi-harmonic oscillator start-up , the output 1.5 ~ 2.5kHZ audio signals , impedance matching push piezo buzzer sound. 3. Electromagnetic buzzer from the oscillator, the electromagnetic coils, magnets, and other components diaphragm and the housing . After power on , the audio signal generated by the oscillator current through the electromagnetic coil , the electromagnetic coil generates a magnetic field . The electromagnetic coil and the diaphragm is the interaction of the magnet, periodically vibrating sound. ARDUINO reference source programme: int buzzer=8;// Set the control the buzzer digital IO pin void setup() { pinMode(buzzer,OUTPUT);// Setting the digital IO pin mode , OUTPUT is Wen out } void loop() { unsigned char i,j;// Define the variable while(1) { for(i=0;i