Specification:
Type: Passive Buzzer Module.
PCB Size:20x15mm/0.79x0.59Inches(LXW).
Operating Voltage: 3.3V-5V.
Passive Buzzer:2 - 5kHz Driving square wave.
Quantity:1PC.

Interface definition: (1) VCC: external 3.3V-5V voltage (can be directly connected to 5V single-chip microcomputer and 3.3V single-chip microcomputer) .
(2) GND: external GND.
(3) I/O: external MCU IO port.

This module is ideally suited to adding noise to your project while functioning with microcontrollers such as the Arduino. This module lets you respond to programmatic changes with a lovely annoying buzzer that can be altered over a range of frequencies to ensure maximum irritation.
To operate the I/O pin must receive a square wave to trigger the buzzer. This can be produced within all popular microcontrollers.
Passive internal sources do not have oscillating sources, so if the DC signal cannot be made to sing.It has to be driven by a 2K-5K square wave (PWM).