Bionaire Warm/Cool Ultrasonic Humidifier for Large Rooms - 1.0 Gallon Tank Capacity. Up to 24 hours run time. 2 Speeds. Large Room. Additional Features: Unique design to fit any home decor. Easy to operate digital touch screen humidistat. Produces both cool and warm mist. Illuminated tank for night time (Blue for Cool Mist, Orange for Warm Mist). UItra fine visible mist. Empty tank indicator. Digital touch screen.