Three gallon Warm Moisture Humidifier quietly runs overnight on one filling to output up to three gallons of moisture per day. Offers two settings to control output. Refill light shows when water needs to be added. Auto shutoff provides added safety. Has a large tank opening for easier cleaning. Medicine cup dispenses soothing vapors and is dishwasher safe. Compact 12" wide by 7" deep by 12-1/10" high three gallon humidifier is recommended for medium to large size rooms.