【Portable & Long-lasting】:Small and portable design, this humidifier is super easy to carry. The air humidifier with 450ml water tank that keeps the room humidifier working over 8 hours on a single fill. 【Warm prompt】: Please pay attention to the following points when using: ① Please soak the cotton swab for 3-5 minutes until it is fully soaked before using. ② Please do NOT add too much essential oils into the humidifier at one tome, which will cause the cotton swab to clog and unusable. ③ Please do NOT loss the spring when replacing the cotton swab. 【Ultra Quiet】This humidifier works almost no noise which offers maximum relaxation during sleeping or study without any nasty noise. 【USB power supply】You can use USB for power supply. Directly power it through a computer, power bank or adapter and other devices compatible with usb set, plug and play. 【Work Efficiently】This cool mist humidifier has 450ml volume, up to 8 hours of runtime. which is very suitable for bedroom and workplace.