ULTRASONIC HOLMES HUMIDIFIER: This energy-efficient Holmes ultrasonic humidifier propels visible, cool mist, with a virtually silent, filter-free operation 120-HOUR RUNTIME COOL- AND WARM-MIST HUMIDIFIER: Holmes humidifier has a 2-gallon-capacity water tank with a 120-hour run time on a full tank and Low setting IDEAL FOR LARGE ROOM: Ideal for large rooms, plus its compact size allows for portability ANTIMICROBIAL PROTECTION: Includes an antimicrobial protective material in the water tank to prevent mold and bacteria growth ADJUSTABLE MIST LEVELS: Includes an electronic control panel to adjust multiple settings for optimal comfort levels; produces warm or cool mist based on your preference. Features three speed settings (Low, Medium, High) EASY-GRIP HANDLE Features an easy-grip tank handle for filling and transporting the water tank NIGHT LIGHT: Features an optional night light that can be used throughout the night. purchased for my dad. He cannot use because of artheritis hands