PC Internal Speaker Buzzer

pc_speaker
$3.99 each

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Want your keyboard to make beeps and boops? This is the ticket!

Wire one of these to your Pro Micro on one of the five PWM pins (the ones that have little circles around them) and then enable QMK audio in your firmware. You can have beeps with each keypress, or transform your whole keyboard into a musical instrument. 

Length: 6cm/ 2.36inches