USB mini humidifier-- it is portable air mist humidifier, perfect and suitable for travel, outdoor, car and many other places. Household mini humidifier-- it is practical humidifier freshener for home or travel. USB design, charging is more convenient. USB air humidifier-- no need to worry about changing the water, you just need to put it in bigger container and it will last you long time. Mist humidifier-- purify your indoor space without water droplets from wet desktop items, which can improve the quality of your living environment. Portable air humidifier-- can help to create clean and non-dry environment for the car, office or bedroom to freshen the air.