Longsun Acoustic is a leading manufacturer and exporter of acoustic products since 1999. We specialize in R&D, design, manufacturing and sale of our main products below to domestic and international companies:► Ultrasonicsensors► Proximitysensors► Piezoelectric buzzer► Loudspeaker► Dynamic and piezoelectric receiver► Transmitter & microphone► Rocking armature transducer► Siren transducer ► OEM & ODM product and so on, it is a division of LONGSUN Corporation who consists of ultrasonic sensor factory, loudspeaker factory and piezoelectric buzzer factory, with total employees over 2000, more than 20,000 square meters production areas, all are managed under ISO 9001: 2008 certificated system, meanwhile with our strong R&D team and up-to-date production equipments based in our factory, we provide customers with the high-quality products and efficient service to meet your different requirements. Our ultimate goal is to provide best acoustic solutions and zero defect quality products to meet our customer's satisfaction and beyond their expectations.