Popu pine S01 Ultra-quiet Cooling Fan with On and Off Button for LaptopFeatures:Mini size、 easy to carryComfortable wind、 suitable for four seasonsPowered by USB or 1 x 2000mAh rechargeable lithium battery (not included)Specification: Model: S01Plug: USBMaterial: PlasticVoltage: 5VProduct weight: 0.247 kgPackage Included: 1 x S01 Cooling Laptop Fan1 x USB Cable