iKKEGOL Mini Portable Wireless Rechargeable Super Strong Wind Fluorescence Cooling Desk Fan - 3 Mode Wind Speed Adjustable (Purple) Portable mini fan powered by lithium rechargeable battery, house,office or outdoor,wherever you are, it always offers cool wind 3 Mode Wind Speed Adjustable,speed 1 is the lowest wind,speed 2 is the medium,speed 3 is maximum High efficient and 2-8 Hours long working time (Depend on the mode you use) Powered by Micro USB charging cable or 18650 rechargeable battery Small and beautiful,strong wind will give you and your family a cool summer