... :3.0MHz; Useage:Ultrasonic Beauty Body Transducer Ultrasonic Ceramic TransducerDiameter:20mm;Frequency:3.0MHz;Useage:Ultrasonic Beauty Body TransducerThe Ultrasonic Transducer use for Beauty Body ... components such as buzzer(Piezo electric, electromagnetic, mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor,Atomization piece, speakers and ...