The Crane Germ Defense Digital Ultrasonic Warm and Cool Mist Humidifier adds moisture to the air, providing relief from sinus irritation, nasal congestion, dry cough, cold, and flu symptoms. Giving you the choice of warm or cool mist at the press of a button, this humidifier creates up to 2.5 gallons of moisture per day, runs up to 55 hours, and includes Antimicrobial Protection to fight mold and mildew in water tank and basin. Suitable for rooms up to 500 square feet. This humidifier does not require a filter to operate. For those who experience cold and cough symptoms, there are few things more soothing than breathing in moist air, especially during dry winter months or when cold symptoms are at their worst. The Crane ultrasonic humidifier runs for up to 24 hours and offers the choice of warm or cool mist, both of which are equally effective in humidifying the air. The added moisture also helps to relieve dry skin, chapped lips, and dry eyes. An auto shut-off feature engages when the water tank is empty to ensure safety, and the humidifier"s nozzle rotates 360 degrees, allowing you to control the direction of the mist. This humidifier is energy-efficient, using less power than a standard light bulb to run. Antimicrobial Protection Prevents Mold and Mildew. Crane"s Germ Defense humidifiers are embedded with small natural antimicrobial silver particles that help prevent bacteria, viruses, and mold from taking hold. This technology helps the humidifier to disperse a clean, germ-free mist. Straightforward, Whisper-Quiet Operation Not only are Crane humidifiers stylish, but they are also easy to use and include a built-in auto-shutoff feature that engages when the water tank is empty to ensure safety. The whisper-quiet operation helps provide for a good night sleep for everyone.