press first： turn on the LED light, color changes automatically
Press second: choose one of LED light color you like
Press third: select dim or bringht color
Press first: continuous mist coming out
Press second: 1 hour timer
Press third: 3 hour timer
Press four: 6 hour timer
Be sure to use a mild detergent if you want to clean the humidifier
Don't fill water over the Max line at any time.
Don't switch on power when the tank is empty.
Clean regularly as per Maintenance instruction to avoid malfunction.