Description: USB Port + Auto Shut off: USB air humidifier, with no water tank, just simply place the humidifier in any water cup or mineral water bottle, then you can enjoy the humid air. This mini humidifier will automatically shut off when water runs out. Adjustable Length: the length of this cool mist humidifier is adjustable, so you can combine with different sizes containers to use. Easy to Use: Play and plug, fill in your bottle or jar, insert it, hit the switch and you good to go for many hours, lasts for 8 hours at constant mist mode, keep you in a comfortable and healthy status. Low Noise: Silent and make mist for whole night, provide reassuring moisture and relaxed environment. Wide Application: Compact size, perfect for home bedroom, office, or car, yoga travel. Specification: Material: ABS, Silicone, Electronic Component Rated Voltage:DC5V Working Current: 250-400mA Rated Power:1.5W Spray Volume: 30-45ml/h Size:60x60x206mm/2.36x2.36x8.11inch Package Includes: 1 Piece Air Humidifier 1 Piece USB Cable Note: It is recommended to replace the cotton core every 2 months