Electric fan diffusers expose essential oils to air without heat. Drops of the essential oil are added to a pad or to water. An electric fan in the diffuser blows air at the pad or water, causing the oils to disperse into the air. An electric, ultrasonic, diffuser dispenses essential oils into the air through vibrations of a plate which causes ultrasonic waves, creating microscopic particles of oils which disperse into the air.
for more info:-https://www.flipkart.com/rene-maurice-aroma-essential-oil-diffuser-ultrasonic-cool-mist-humidifier-400ml-tank-capacity-7-color-mood-changing-led-lights-wood-grain-black-15ml/p/itmfd85cqxzuqtdj