... Diameter:25mm; 3. Frequency:1.7MHz; Ultrasonic Atomizer for Humidifier1. Type:Glass-glazed;2. Diameter:25mm;3. ... piezoelectric ceramic element, SMD magnetic transducers, condenser microphones, ultrasonic sensor,Atomization piece, speakers and other audio components. ... watches, toys, alarm systems, reversing radar, ultrasonic cleaning, ultrasonic atomization, marine fish exploration, the range of ...