szwisechip 180 ml Portable USB humidifier, car Aromatherapy Perfume humidifier Diffuser Essential Oils (Black) 90% Plastic Imported CN Two level humidification and protection function of outage in case of no water Humidifier for car, home and office. power by USB, car adaptor in pack. Two-level humidifiction Three power supply method: AC/DC adaptor, USB Cabel, Car adatpor Excellent USB powered humidifier for car, home, office aromatherapy oil diffuser