The Avalon Ultrasonic Humidifier with Filter, Aroma Diffuser, and 7 Color LED Nightlight is an elegant humidifier with 7 LED color light alternatives to illuminate the tank. The humidifier is geared up with a ceramic filter to eliminate bacteria and mineral build-up in the device. The back of the humidifier also has a built-in vital oil box to make the unit a scent diffuser also. The humidifier tank holds up to 2.8 liters of water and will last 10 hours. The unit has a quickly adjustable knob to adjust the mist flow. The mist output nozzle can be turned 360 degrees to blow the mist in any wanted instructions you pick. This humidifier is ETL noted and meets all safety regulations.