This Honeywell White Warm Mist Humidifier provides soothing comfort with an essential oil feature. The essential oil feature can be used with essential oils or liquid inhalants. This humidifier provides a quiet, filter free operation, perfect for a medium size bedroom, and the warm visible mist is 95% bacteria free. It is easy to fill and clean with a wide tank opening and dishwasher safe parts. A refill light illuminates when the water tank needs to be filled. 1) Two moisture output settings, 2) Auto shut off when empty, 3) Tank capacity: 1 gallon, 4) Run time per filling: up to 24 hrs., 5) Output per day: 2 gallons.