Homasy USB Cool Mist Humidifier, Automatic Shut-Off, Essential Oil Diffuser for Home (Blue) Powered by USB. With the input voltage of DC 5V, the aroma diffuser works on a USB port LED Color Lamp. With seven changing colors, it creates soothing and romantic atmosphere for you Safety System. It will be auto shut off without water. Never worry about dry heating and just enjoy the intelligent life Innovative Design. Shaped like a graceful bean for you small room, like office, home, school, hospital, hotel, yoga room etc. Multi-functional. Adding several drops of essential oils(not included) into the water. It also can be act as a humidifier