Homedics Ultrasonic Humidifiers are designed for large rooms, utilizing high-frequency technology to create a fine mist, suitable for spaces up to 426 sq. ft. The top-fill tank holds 1.47 gallons and offers up to 70 hours of runtime. It operates quietly, making it ideal for nighttime use, and includes a built-in night-light. Users can enhance the mist with essential oils using the three provided pads and benefit from a demineralization cartridge. The humidifier features three mist settings, an auto-off timer with three options, and a programmable Digital Humidistat to maintain desired humidity levels. The package includes the humidifier, an instruction book, essential oil pads, a demineralization cartridge, and a 2-year warranty.