Adruino Passive Buzzer Module:

This module serves as a passive buzzer's breakout board. The work involved with passive buzzers is slightly higher than that of their active buzzer counterparts. One of these buzzers requires the user to feed in an oscillating waveform in order to make a tone; the amplitude of this waveform directly correlates to the "loudness" of the sound that is produced. The primary benefit of passive buzzers over active buzzers is their ability to produce tones at multiple frequencies.