This Ultrasonic Humidifier Power Circuit Board with Atomizing Chip Moisture Film Humidification atomization machine is; suitable for the atomization plate tablet with a diameter of 20mm. This Ultrasonic Humidifier Piezoelectric Transmitter module works on the principle of cavitations produced by sound waves. Just provide the DC 5V power supply it will turn into a mini ultrasonic atomizer. As sounds waves contain compression and rarefaction. Due to extremely rapid movement, water droplets can no longer sustain their liquid state and get converted into vapor immediately. This vibration is produced by a piezoelectric filament.