ULTRASONIC TECHNOLOGY – The Homedics Ultrasonic Humidifiers for large rooms have high-frequency technology that converts water into a fine, evenly dispersed mist; ideal as a bedroom humidifier and for family rooms up to 426 sq. ft. TOP-FILL HUMIDIFIER – The easy to fill tank holds 1.47-gallons of water and provides up to 70 hours of cool mist runtime per fill QUIET & CONVENIENT - Perfect for nighttime use with whisper-quiet operation and built-in night-light; add your favorite scent to the cool mist humidifiers with 3 included essential oil pads; includes 1 demineralization cartridge CUSTOMIZED SETTINGS - Choose from 3 cool mist settings on the personal room humidifier; built-in auto-off timer includes 3 timed options; programmable Digital Humidstat helps maintain desired room humidity WHAT’S IN THE BOX – (1) Homedics Ultrasonic Large Humidifier, (1) Instruction Book, (3) Essential Oil Tray Pads, (1) Demineralization Cartridge, (1) 2-Year Warranty