How to Judge It Is an Ultrasonic Humidifier
As long as this seems to be "white smoke" is the principle of ultrasound. It is to use ultrasonic diaphragm to break water into small water droplets (not water vapor, or water, but each water droplet is very small, that is, see "white smoke"), and then use a fan to spray these small water droplets. Some small usb humidifiers do not have a fan, but larger humidifiers are usually available, usually with the fan built into the base. The noise of the ultrasonic humidifier comes from two places. One is an ultrasonic generator, generally with water, the noise is very small), and the other one is a fan.