Description:

Apply 3V to 5V to this buzzer module and you’ll be rewarded with a loud 2KHz BEEP. Unlike a plain piezo, this buzzer does not need an AC signal. Inside is a piezo plus the driver circuitry that makes it oscillate at 2KHz. On one hand, that makes it really great for integrating into projects because you don’t need an oscillating control signal. On the other hand, you cannot change the frequency.
Specifications:
Dimensions (not including pins): 12mm diameter, 9.7mm tall.
Pins are 6mm long and 0.3″ apart.