Safe and Auto Shut-OffDon't worry about dry running when you are sleeping, when the water runs out, the mini USB humidifier automatically shuts off, which is very safe and energy saving. There will be a light on when you use it, so you won't feel afraid when you sleep alone.300ml CapacityThis mini USB humidifier with fine workmanship possesses 300ml large capacity water tank, providing more convenience. It can be used for a long time when filled with water at a time, which is very simple and practical. Space SavingThis mini USB humidifier adopts coffee cup shape design, small in size and light in weight, which is portable and space saving, you can take it to wherever you want. It can be an ideal and unique gift for your friends and family.Simple to OperateJust fill with water and push the button of humidifier for bedroom, then enjoying the soothing and comfortable environment. The only one-button operation makes it very intuitive to use.Silent OperationIt also humidifies the air quickly, and it is extra quiet while running. This mini USB humidifier possesses low noise operation lower than 30 decibel, providing silent and comfortable environment.