Snake Repeller Piezo Electric Buzzer 90dB Black ABS Material Wire
15mA (Max)at Rated Voltage
Sound output at 10cm
Min 90dB(Typ.)at 10CM 12Vp-p, 3.5±0.5khz
How to distinguish active and passive buzzer?
An active buzzer will generate a tone using an internal oscillator,
so all that is needed is a DC voltage.
A passive buzzer requires an AC signal to make a sound.
To identify them, if you apply a DC voltage to them and it buzzes,
it's an active.
Advantages and disadvantages of piezo?
Advantages:They generate a voltage proportional to the velocity the
crystal is deformed so require no local power source.
Disadvantages: They are high impedence and can pick up stray
voltages in the connecting wires. The crystal is also prone to
cracking if overstressed.