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The mechanical buzzer uses a magnet to move a reed up and down quickly to emit a lower-pitch buzz! It’s quieter than the piezoelectric buzzer but uses more power, so you the terminals will have to be closer to the battery packs. To use them, you’ll need to match the wire colors to the wires from the battery pack.
If the volume is too loud, simply use a piece of tape over the top hole on the buzzer and the volume will substantially lower.