Over 99.9% of germs in the room can be removed in 2 hours with innovative micro-electrolysis sterilization technology of this advanced Ultrasonic Humidifier with UV Sterilization by Allin Exporters. The Cool Mist Ultrasonic Humidifier keeps humidity at a comfortable level between 40 to 90% to help people with dry skin, irritated eyes, and cracked lips along with breathing comfort in winter.