This ultrasonic humidifier, Air-O-Swiss 7142 uses high-frequency vibrations to turn the water into a micro fine mist, which is blown into the room, where it immediately evaporates. A replaceable demineralization cartridge using Ag+ Ionic silver technology, ensures water mist without lime scale or mineral residues. The Air-O-Swiss humidifiers also employ the quad-band microbial protection system guarantying that the water can be kept free from harmful bacteria and viruses. The system utilizes an ionic silver stick that uses the natural sanitizing properties of silver to sanitize, above mentioned high-frequency vibrations and a demineralization cartridge with Ag+ technology, and high preheating water temperatures of 176° F or 80° C. The mist exits the ultrasonic humidifier at a comfortable body temperature of 104° F or 40° C if you choose the pre-heating function. The Intelligent Temperature Compensation technology monitors the temperature and automatically adjusts the output when conditions change. The powerful yet elegant Air-O-Swiss 7142 easily humidifies 860 sq. ft. or 80 sq. meters. An easy to read LCD and control panel allow you to quickly change settings. Special Sleep mode helps these ultrasonic humidifiers to pre-determine a comfortable night humidity level. The timer can be regulated between 1 and 8 hours or for continuous operation. Easy to fill detachable 2-gallon water reservoir and transparent water tank with clear water level visibility. Empty and cleaning indicators. Elegant and sleek design with small footprint. The humidity output, when used with pre-heating to 176° F, is up to 3.5 gallons in 24 hours. See current prices for these digital ultrasonic Air-O-Swiss humidifiers.