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Module description
The 1 module adopts S8550 transistor drive
2 operating voltage 3.3V-5V
3 with fixed bolt hole for easy installation
4 small size: 3.2cm * 1.3cm PCB
5 when the I/O port input low, buzzer sound
Two module interface specification (3 wire)
1 VCC external 3.3V-5V voltage (can be directly connected with the 5V microcontroller and 3.3V microcontroller)
2 GND external GND
3 I/O MCU IO port
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