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The humidifier needs to be watered frequently. Otherwise, it will work in non-normal state. But we often ignore this problem. The traditional structure of the humidifier is changed, which allows it to lean according to the volume of water inside. This will inform us the state of the humidifier and remind us to water it directly. The indicating light becomes bright when there is less than ten percent water inside, reminding us to add water. The lights will also become bright when we add water to 50 percent and 100 percent. This helps to avoid wasting water.