Truedays Mini Portable Ultrasonic Mist Water Humidifier USB Air Purifier,Pink New version mini portable humidifier, cool mist humidifier, desk humidifier, ultrasonic humidifier, travel-size humidifier with super soft and smooth mist Easy to use,1 touch press button for power on/off.provides a quiet and aromatic environment for sleeping and working USB cable power supply, plug it in computer,laptop or with power adapter then it will works. Moisturizing your skin.Portable for Car,Office,Home,Yoga,OfficePLEASE MAKE THE STRING COMPLETELY WET BEFORE YOU USING THIS HUMIDIFIER) Please use pure water to protect the humidifier, avoiding to use essential oil or other chemical corrosive substances.