WINDCHASER HUNI Ultrasonic Negative Ion Humidifier with Nite-Lite Advanced ultrasonic humidifier from WindChaser; convenient adjustable humidistat Mist propelled by high frequency sound vibrations; hourly moisture capacity of 120 cubic centimeters 5-gallon water tank for 15 hours of humidity; automatic shutdown when tank runs dry Releases negative ions into the air to neutralize bacteria and mold; enhanced visibility by night light Measures 11-1/3 by 9-2/3 by 6-1/10 inches with a 5-pound shipping weight