A cold-air diffuser uses water and a vibrating plate to push out tiny particles of the essential oil drops placed in it. It leaves a mind and body renewing mist in the air for hours. If my kids are under the weather, I diffuse Thieves in their bedroom. After work, I diffuse Stress Away by my chair. I love to diffuse Lavender and Frankincense all day on Sunday. It leaves everyone feeling peaceful and calm. How will you diffuse?