ddLUCK Mini Rechargeable Portable Table Fan 4 inch Mini fan Rechargeable Desktop Fan Battery/ USB Powered Mute Cooler Fan (White) Cute in appearance, small in size, easy to carry. Portable and convenient for travel, home, office, etc.. Adjustable wind mode: three wind speeds with brushless motor. More sturdy and produces strong wind. Built-in rechargeable lithium-ion battery but do NOT use while charging. Fully charged( but less than 10 hours) can be used for almost lasting 4 hours at the second wind speed. Environmentally friendly ABS material: safe and sturdy. Adjustable base enables more blow choices. EVA shoes make it more stable and quiet while using.