Patlite buzzer element, magnetic sounder, 80 dB at 1m, 3 kHz tone frequency | eBay
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Buzzer - STEMify
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10pcs Active Buzzer Magnetic 5V Long Continous Beep Tone 12*9.5mm For Arduino | eBay
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Lesson 13 Button Piano — SunFounder electronic-kit documentation
Use tone() with Arduino for an Easy Way to Make Noise
PWM (Part 2) - Sound and Frequency with Piezo Buzzer | Just Another Jal Website
L5: Playing tones - Physical Computing
Use tone() with Arduino for an Easy Way to Make Noise
How to Use Active and Passive Buzzers on the Arduino - Circuit Basics
