Krypton KNF6039 Rechargeable Fan is unique and fashionable, using the German Brushless DC motor to ensure the high winds and long-life. Intelligent control system; reliable performance; which is fully functional and easy operation. Standard interface; can mix and match digital devices; such as: desktop computers; laptops;; car charger and so on; plug and play Battery Specification 18650Li-ion. The fan is operated by Rechargeable Battery which can be operated using the international standard 18650 capacity lithium batteries; that can be recycled.