For the most part, I have this cool little device running all day long when I'm in the office (sits right on my desk). It's about 8 inches tall and disperses essential oils without the use of heat, but rather by fan and with the right essential oil sprinkled on the cartridge, it will make your whole room smell delicious. You'll feel a cool & quiet breeze when it's on. Received this as a birthday gift and I love it. I diffuse some of my favorite Oshadi and Primavera (organic) essential oils in it and I'll be sad when it stops working (but I'll just go buy another...cause that's how much I adore this little guy!).