Optimus U-31001 1.5-Gallon Cool Mist Ultrasonic HumidifierOperates up to 18 ho...Optimus U-31001 1.5-Gallon Cool Mist Ultrasonic HumidifierOperates up to 18 hoursWater-empty auto shutoff switch and refill lightAdjustable mist volume controlEasy-to-fill transparent water tankWhisper-quiet operationRemovable tank with handle for easy...more