A piezo buzzer is a small, compact electronic device commonly used for producing sound alerts or tones in various applications. Unlike traditional electromagnetic buzzers, a piezo buzzer operates on the principle of the piezoelectric effect. When an electrical voltage is applied to its piezoelectric material, it deforms and generates sound waves, producing a high-pitched tone. Due to their simplicity, durability, and low power consumption, piezo buzzers are often found in alarm systems, timers, electronic toys, and other devices where a loud and clear audible signal is required. This 24mm diameter piezo buzzer can be used to output a 3.8kHz tone or detect knocks by reading the voltage produced across the element.