Ultrasonic cool mist technology safely and quickly moisturizes dry air for up to 25 hours of continuous operation in medium to large rooms up to 250 square feet. High and low-speed settings combined with a 360'mist nozzle help you consistently balance and regulate the humidity in your home all year long for relief from congestion, allergies, dry skin, and sinus issues. The optional night light offers a soothing glow while the whisper-quiet operation ensures you can sleep peacefully without any disturbance. The sleek and transparent 1.5 liter water tank is easy to fill right from your kitchen or bathroom sink and the compact design doesn't take up too much tabletop space. Plus, the automatic shut-off feature turns the humidifier off when the water level is low or the tank is removed.