The lovable Crane Elephant humidifier is simple to operate and will quietly aim a soothing cool mist high into the air right out of its trunk. After putting it through the test overnight we were very pleased to find that a full tank ran continuously on high without running out of water. However, there is an auto shut-off safety sensor in case it runs empty. Mr. Elephant will ultimately provide comfort day and night while also becoming a wonderful "pet" to any child.