EASY TO USE: Portable USB humidifier is very easy to operate. ULTRASONIC QUIET OPERATION: Keep below 30d B to ensure that the ultra-quiet operation will not disturb your sleep and work. Provide a soothing spray to keep your living environment with enough humidity to avoid respiratory diseases caused by dry air and improve your quality of life. WARM GIFT: The humidifier is made of durable materials, providing long-lasting usability and can be used in the bedroom, office, car. The best gift for family and friends on Christmas, Thanksgiving, New Years, birthdays or other important days.