USB Fan, GRDE Portable 3 Speed Table Desktop Personal Fan, Rechargeable Battery USB Cord Included Rechargeable fan: Built-in 18650 international standard rechargeable lithium battery with large capacity support longer working time on a charge. Friendly fan: Equipped with pure copper and brush-less motor, which is featured with quite operation, durable and efficient energy saving. Portable fan: mini fan come with micro USB cable, widely compatible for most USB power source, convenient and comfortable to use. 3-Speed fan: Three options of wind speed. (Breeze, natural wind, and powerful wind.) apply for multiple purposes. Personal fan: light weight with only 7.6 oz, easy to carry design makes it available to use whenever and wherever.