This mini humidifier works in whisper-quite operation and add cool mist to the air. Small and easy to operate, it can be easily plugged into the USB interface. Moreover, its auto shut-off function will ensure you a sound and safe sleep overnight. Portable Cool Mist Diffuser Aroma Air Humidifier with Colorful Change for Car, Office, Babies, Room This Colorful Cool humidifier car humidifier Power Supply compatible with any device USB port which ensures it can be in the car for travel and be used bedroom, lounge room, yoga, spa as well. Moisturize at any time, enjoy the healthy air everywhere.