Bionaire Ultrasonic Humidifier with Warm & Cool Options Offers both warm mist and cool mist humidity options Intelligent controls allow you to effortlessly select the appropriate humidity based on your need 5 unique pre-programmed settings target the appropriate temperature and humidity level or use manual setting for personalized comfort .78 gallon tank capacity; Up to 24 hour runtime; 2 comfort settings; Digital Timer; Digital humidistat Ultra-quiet operation; Antimicrobial protection to help prevent the growth of bacteria