Ultrasonic humidifier that helps reduce the dryness of the environment. Suitable for large stays. Extremely quiet thanks to its ultrasonic technology that will help you maintain a good smell and atmosphere in your home. USB powered, convenient to carry. It can also be used for charging, it can work independently for more than 4 hours 260ml water tank design can humidify the air for up to 4-8 hours Ultrasonic cool mist for humidification - 50ml/hour With humidifier Spare filters Quiet operation less than 30dB Number of shipments:1 pcs< /p>