PUI Audio SMT-0840-T Surface-Mount Transducer is a top-firing electromagnetic transducer offering 100dB output at a resonance of 4kHz. This transducer ensures reliable operation under harsh conditions and consumes less power. The SMT-0840-T surface-mount transducer features high efficiency, low current drain, low weight, and a long lifespan. This transducer is ideal for medical, industrial, security, and consumer applications.