Specification：
1.The module is driven by S8550 transistor.
2.Working voltage 3.3V-5V.
3.Designed with holes for fixing with bolt, so it is easy to assemble.
4.Small board PCB size: 32 x 13mm / 1.26 x 0.51in
5.When the I/O port input low level, the buzzer will sound

Introduction of active buzzer：
1. The active buzzer has internal oscillation, so it will beep as soon as it is powered on.
2. The program control is convenient. A single high and low level of the microcontroller can make it sound, but the passive buzzer cannot.
Note: The "source" here does not refer to the power supply, but to the oscillation source.

Interface Description:
1. VCC is externally connected to 3.3V-5V voltage (can be directly connected to 5V microcontroller and 3.3V microcontroller)
2. GND is externally connected to GND
3. I/O external MCU IO port

Package Includes:
5 x Active Low Level Trigger Buzzer Alarm Sound Modules
1 x 15pin Female to Male Dupont Cable