Active Buzzer Alarm 5v Sounder speaker Buzzer 12095 12*9.5mm M.(7*3)

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Arduino: Piezo speakers (buzzers) A "piezo buzzer" is basically a tiny speaker that you can connect directly to an Arduino. ... You have to tell it which pin the buzzer is on, what frequency (in Hertz, Hz) you want, and how long (in milliseconds) you want it to keep making the tone.