Description
There is no vibration and source inside the passive, so if the DC signal cannot be used to make its tweet, it must be driven by a 2K"5K square wave. The sound frequency is controllable, and it can be produced. Some special cases, you can drink LED and reuse a control port.
Features
1. The module is driven by a 9012 transistor
2. Working voltage 3.3V-5V
3. With fixing bolt holes for easy installation
4. Small board PCB size: 3.3cm * 1.3cm