[Air Humidifier] Use this product as a non-aromatherapy humidifier by adding pure water into the water tank. It will produce cool mist, humidify the air and moisturize your skin. Deal with the problem of dry skin and help you have better sleep by distributing aromatic fragrance to the surroundings.[Aroma Diffuser] Use this product as an aroma diffuser by adding essential oils and water into the water tank. It will generate ultrasonic vibrations at a frequency of 2.4 million times per second, in order to change water and essential oils into superior tiny micro-particles without heat. Properly give out the healing and natural properties of essential oil via cool mist.