1.[Portable desktop humidifier] This mini car humidifier is small and light which is easy to carry. It is suitable in bedrooms, offices, living rooms, cars and travelling.2.[Silent operation/USB power] With sound-free design, it only creates sound less than 35 dB which is very quiet, giving you a perfect sleep. You can even use it with children and pets at home. With the USB power port, you can charge it with computers and mobile phone.3.[7 colors LED night light/car humidifier] 7 colors LED night light will give you more choice to find your favorite color. Just plug it into the car's USB port.4.[One button for all controls] Spray: single click the function button to spray continuously for 4.5 hours; double click the function button to spray for 9 hours at intervals (3s). Night light: press and hold the function button for 1.5 seconds to turn on the 7 colors night light mode; press and hold the button for another 1.5 seconds to fix the light; press and hold for 1.5 seconds again to turn off the night light mode.