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This safety feature uses a water level sensor to stop the nebulizer once the water level sinks below the required level in the water basin. A small orange light will appear to indicate that the humidifier has automatically turned off. Turn the humidifier off and unplug before removing and refilling the water tank. HOW TO REMOVE AND ATTACH MIST CHANNEL 1. To remove mist chamber, slide mist chamber latch to left. Lift mist chamber off of the water basin. 2. To attach the mist chamber slide mist