This product is a humidifier to keeping higher humidity for bedroom,office and other place. LevelⅠis automatic spraying every 2-3 seconds  - operation time around 4 Hr.allowed if water bowl is full of water.LevelⅡis Continuous Spraying - operation time around 3Hr.allowed If water bowl is full of water.Time alarm around 4.5 - 5 Hr., it will stop spray and off green or blue light,but red light will be lighting.