Keep your home and office space clean with The RGB Bulb Humidifier. Powered by USB with a 400 ml water tank, this creative bulb design works as a humidifier and a nightlight in any room. Creates a cool mist that will add moisture and eliminate the dryness. The result is fresh air that keeps the skin moist. 2 Modes: 7- color changing and single mode Unique bulb design is similar to a snow globe with an adorable Palm tree center Powered by USB (DC 5V), portable and lightweight