Evaporative humidification with air circulation draws dry air in and pushes moist cool air back into the room 2 ways oLow water level indicator with auto shut offf water refill: top refill and water tank refill 1-knob operation,Wick filter (included) captures minerals and deposit no white dust Replacement Wick Filter F-4023 (Set of 2) is available for purchase 1 gallon (3.7 liters) water tank,3 speeds, Essential oil compartment
