Evaporative cooling Microcomputer control,color LED display,portable Actice oxygen ion ... 150pcs Water tank: 20LSandard Room Dimension 25-30m2 Function Introduction:Evaporative cooling,humidifying air.large diameter centrifugal rotor,large wind,low ... alarm function for water shortage. Brake caster easy to move. Evaporative Air Cooler (energy-saving )