Vornado Whole Room Ultrasonic Digital Humidifier:Ultrasonic HumidificationVortex assisted whole room humidity circulationCool or warm mist optionLCD digital readout with built-in remindersElectronic Humidistat for automatic humidity controlAutomatic shut off when the water level gets too lowWhisper-quiet operationMineral cartridge prevents minerals and calcium buildupLarge 2 gallon water capacitySpill-proof water tankOutput of up to 3.5 gallons per dayCoverage up to 1250 sq. ft.5 years limited warranty