... 2. Diameter:25mm; 3. Frequency:1.7MHz; Ultrasonic Atomizer for Humidifier1. Type:Glass-glazed;2. Diameter ... 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 ultrasound ...