This ultrasonic transducer is for mini humidifier and USB humidifier. It consists of a rectangular piezoelectric ceramic plate and a rectangular mesh membrane with ums tiny conic holes on it, ant they are joined together. It is the most vital component for ultrasonic vibrating mesh technology. With the ultrasonic vibrating mesh technology, our mini humidifiers and music humidifier can be such small, smart, low-power-consumed and effective. As the picture, it is one of our models. The size of piezoelectric ceramic is 18.2mm*13mm*1.0mm. The size of alloy mesh is 20mm*18mm*0.06mm Fr=131khz R0<2ohm Cp=3000p Kp>55% Qm>800 Tan delta <0.5%