High quality materialMade of brass and ceramic, offering long service life, good heat resistance, and stable performance. The copper sheet diameter is 27mm. The white piezoelectric component measures 20mm. Easy to useCan be directly connected to wires without soldering. For added protection, optional reinforcement can be applied to the connection point. Good performancePiezoelectric ceramic buzzer is a sound-producing element with a flat sheet design, suitable for compact, lightweight electronic devices such as temperature guns, electronic tables, household appliances, electronic toys, instruments, remote control devices, and other electronic products. Used for audible alerts and sound signaling; can also function as a sound sensor in acoustic control electronics. Piezoelectric buzzer featuresCompact size, thin and lightweight design, clear sound output, low power consumption, quiet operation, high transduction efficiency, and wide operating range. Wide range of applicationsSuitable for communication devices, digital products, home appliance control boards, electronic medical equipment, car alarms, security alarms, electronic loss prevention systems, electronic sound toys, and instrumentation.