... 0MHz; Useage:Ultrasonic Beauty Body Transducer Ultrasonic Ceramic TransducerDiameter:20mm;Frequency:3.0MHz;Useage:Ultrasonic ... as buzzer(Piezo electric, electromagnetic, mechanical), piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic ... products are widely used in household appliances equipment, watches, toys, alarm systems, reversing radar, ultrasonic cleaning ...