Features: Power Bank4000mAh large capacity, charging at any time. 3-SpeedsThree speeds wind speed adjustable design. Adjustable Air OutletThe air outlet can be adjusted, blowing wherever you want. Mini PortableSmall size, light weight, strong wind,It can be hung on the neck or the waist; More SecureSoft and hard glue combination technology, slow down the impact force and prevent accidental falling. Material:ABS+TPU; Color:Green/Blue; Size:4.9*8*10.9cm Cell Type:Lithium polymer cell; Battery Capacity:4000mAh (3.7V /14.8Wh); Rated Capacity:2300mAH(5V/2A); Energy Conversion Rate:75%; Charging Time:about 3-4 hours; USB Cable Length:30cm; Quantity: 1pc Note:Manual measurement, there may be 1-2cm/1-3g error, which is not a quality problem. Due to different screen displays, there may be a color difference between the real object and the picture, and the main picture shall prevail.