Sunpentown SU-9210 Digital Evaporative Humidifier by SPT Evaporative humidification with air circulation draws dry air in and pushes moist cool air back into the room Digital humidistat (35% to 85%) or continuous operation - Filter captures minerals and deposit - no white dust LCD panel with filter dirtiness indicator - 1 gallon (3.7 liters) water tank 2 fan speeds - 1 to 10 hours timer - ETL