The CPT12A03-4.5R is a miniature 12mm external drive piezoelectric buzzer manufactured by ChinaSound. Supreme Components International is an authorised distributor of ChinaSound components. This buzzer is specifically designed for operation at 4.5V, making it suitable for a wide range of low-voltage applications. Despite its small size, it produces a powerful sound output of at least 85dB at a frequency of 4kHz. This makes it an excellent choice for applications where a clear and audible alert is necessary. Its compact design allows for easy integration into various electronic devices and projects. The CPT12A03-4.5R offers a reliable and efficient solution for audible signaling needs.