After connecting the power supply, put the product upside down for 3 minutes, make the filter tube completely wet, and then put it back in the correct position. Try this method again to see if it can be used Ultrasonic Air Humidifier Function: The diffuser uses ultrasonic technology for silent operation. It doesn't interfere with your sleep. Beauty moisturizing, car, home, office, multi-purpose. Safety automatic shutdown when water runs out