1.Module using S8050 transistor drive;

2.Operating Voltage 3.3V-5V;

3.With fixed bolt hole for easy installation;

4.Small plates PCB size: 3.2cm * 1.3cm;

5.When the I / O port input is low level, the buzzer sounds;

6.Module Interface Description (3-wire);

VCC external 3.3V-5V voltage (can be directly connected to 5v and 3.3v MCU);

GND external GND;

I / O external microcontroller IO port;