This adorable penguin humidifier not only has a kid-friendly design but also whisper-quiet operation. Auto-off function when water tank is empty is a great safety feature. Humidifier has variable mist output control and auto-off function when tank is empty. Easy-to-fill, removable water tank can be easily stored. 1 gallon water tank runs 11 to 24 hours (2.1 gallon output per 24 hours) and humidifier is suitable for rooms measuring approximately 250 sq. feet. ETL listed. 1-year limited manufacturer's warranty. Model EE-0865.