Gift Pro Ultrasonic Cool Mist Humidifier 300ml For Skin Moisturing,Stealth Mask With No Noise,Waterless Auto Off,LED Lights,Perfect for Baby Room,Bedroom,Office,Spa,Yoga,Car (White) USB cable power supply, plug it in computer,laptop or with power adapter then it will works. Whisper-Quiet Ultrasonic Operation - humidify your living space to prevent dry, stuffy air and flu/cold germs infecting your loved ones. Prevent dry and chapped skin in dry winter months. Shuts Off Automatically When The Water Runs Out. Portable for Car,Office,Home,Yoga,Office,Spa, Bedroom,Baby Room.Perfect gift idea for family and friends. ABS material Eco-friendly,Water capacity:300ml,Size:110x110x85mm Please use pure water to protect the humidifier, avoiding to use essential oil or other chemical corrosive substances.