Portable, stylish ultrasonic humidifier. Ideal for anyone who suffers from allergies, asthma, or sinus pressure. Provides up to 3.5 gallons of humidity output per day. Choose between a warm or cool mist. Covers large rooms up to 850 sq. ft.. Install the stylish William Ultrasonic Humidifier in your bedroom, nursery or office. No matter the season, the addition of gentle moisture will help relieve dry skin, sore throats, swollen nasal passages, and asthma. Ultrasonic technology allows you to quietly disperse either a satisfying warm or cool micro-fine mist to balance dry air. William allows you to keep your home climate at the perfect humidity level without sacrificing style.. . . . . Extremely quiet and powerful with low power consumption. Tank capacity is 1.5 gallons. Special features include an integrated hygrostat, preheating, sleep mode with dimmed lights, and 3 output levels. Black finish. View Owner's Manual (PDF format).