The avalon ultrasonic humidifier with filter, aroma diffuser, and 7 color led nightlight is a stylish humidifier with 7 led color light options to light up the tank. The humidifier is equipped with a ceramic filter to eliminate bacteria and mineral build-up in the machine. The back of the humidifier also has a built-in essential oil box to make the unit an aroma diffuser as well. The humidifier tank holds up to 2. 8 liters of water and will last 10 hours. The unit has an easily adjustable knob to adjust the mist flow. This humidifier is etl listed and meets all safety regulations.