Warning Buzzer & Chime
Product introduction
Buzzer (SOT plastic packaging) Active buzzer with long sound

The characteristics of a passive buzzer are:
1. The passive internal does not come with a vibration , so it cannot be beeped using a DC signal.
It must be driven by a 2K-5K square wave
The frequency of the sound is controllable, which can create the effect of "Dorami Fa Saurasi".
In some special cases, a control port can be reused with an LED
The characteristics of an active buzzer are:
The active buzzer has an internal vibration , so it will beep as soon as it is powered on
2. Convenient program control, the microcontroller can emit sound with just one high or low level, but the passive buzzer cannot.