3.3V Electromagnetic Active Buzzer - Pack of 5
|+100 8 % $0.69|
|+300 11 % $0.67|
|+500 12 % $0.66|
|+1000 15 % $0.64|
It will work when the power is on, not work when the power is off.
Electromagnetic & Piezos Difference: Only in different within continuity buzzer, it is two kinds of way to speak.
Tim's experience, the piezo is more easy to work under low current, even io current of MCU.
But the electromagnetic one would be more " Noisy"
3.3V ACTIVE BUZZER SPEAKER