Xboard 3 Speeds Rechargeable Mini USB Fan Portable Desktop Fan with LED Light - Light blue Portable: Small and exquisite (4 inch) design, pocket size ,easy to carry ,just throw into your bag or use the carabiner and lanyard to hang. 3 Gears to adjust wind speed for meeting your needed and LED light on side for emergency illumination Dual power source, plug in with the USB adapter or use with the battery ,bringing you convenience where you go. Using the brushless motor industrial grade fans, pretty large winds and long life guaranteed. Battery type: Li-ion 18650 3.7V (INCLUDED).