Our 4L top-fill humidifier has a working time of up to 12 hours and a mist output of 250 mL/h, covering an area of 25-40 m². Large rooms are also easily humidified! Ideal for bedrooms, living rooms, nurseries, and offices. This humidifier operates at a near-silent frequency and includes a sleep mode feature, making it ideal for use at night. When in sleep mode, the display turns off automatically, and the low noise level keeps you from being disturbed while sleeping, working, learning, or relaxing. This humidifier includes an aroma box where you can add 2 drops of undiluted essential oils to create a delightful fragrance.