... : No risk of over heating and / or explosion since the cool mist is generated by ultrasonic, not flame or any kinds of ... the recommended water level.5. Functions: Can be used as humidifier, atomizer, and air purifier.6. Features: Special night-light installed ... the recommended water level.5. Functions: Can be used as humidifier, atomizer, and air purifier.6. Features: Special night-light installed ...