High quality material--Made of excellent material brass+ceramic, long use time, good heat resistance and stability performance.The diameter of copper sheet is 27mm.The white piezoelectric part is 20mm Easy to use---Can be directly connected to the wire at the end of the wire, no need to weld. If you need to strengthen the protection, you can add extra protection on the welding point. Good performance - Piezoelectric ceramic buzzer is a piezoelectric ceramic sounding element, the shape of the sheet, suitable for miniaturization, thin electronic, electrical products such as: the amount of temperature gun, electronic table, household appliances, electronic toys, instruments, remote control appliances and other electronic products, the sound, warning of the use of sound, can also be used as a sound sensor for acoustic control electronics Piezoelectric buzzer features - Small volume, thin and light, clear sound, low power consumption, no noise, high transduction efficiency, wide range of work Wide range of applications - Communication products, digital products, home appliances control board, electronic medical equipment, car alarm, security alarm, electronic loss prevention device, electronic sound toys, instrumentation