Active buzzer module
The KY-012 Module is a 5V beeper.
This buzzer is different from an passive one, where an active buzzer will make a beep on its own thanks to the build-in frequency generation board an passive one needs your microcontroller to create the sound frequencies. In short, if you just need a beep then you use an active buzzer module if you want to create melodies etc. you need a passive buzzer module.
Active buzzer module Quick Spec
colour Black + silver gray
Package dimension: 77x42x13mm