Specification: Type: Passive Buzzer Module PCB Dimension:20x15mm/0.79x0.59"(LXW) Operating Voltage: 3.3V-5V Passive Buzzer:2 - 5kHz Driving square wave 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). Package included: 1PCS Passive Buzzer Module

Compatibility: Compatible with Arduino UNO R3, Arduino Mega2560, STM32, Raspberry,etc. Operating Voltage: 3.3V-5V. PCB dimension:20x15mm/0.79x0.59"(LXW).Passive Buzzer:2 - 5kHz Driving square wave. Can be set the PWM output frequency and durationto produce different tones. Be accorded to the song numbered musical notation can be used for DIY birthday card. The passive buzzer module is driven by 9012 triode,and it is a piezoelectric speaker. Package:1PC Passive Buzzer Module.Made from high quality material. Easy to install and plug. Durable, long service life.