This is a small portable 40mm fan which you can adjust the power using the potenziometer on the side. To make this project it is expected you know how to do basic soldering and you have basic solder supply's, all of the other components will be in the Bill of materials below. The wiring is in the last photo but for those who can't see it:

-Battery + and - to TP4056 B+ and B-
-TP4056 Out + and Out- to MT3608 Vin + and Vin -
-MT3608 Vout + and Vout - to correspectly Fan + and Center leg of slide switch
And finally Fan - to one of the two legs of the slide switch (depending on witch direction you want to slide the switch to turn it on)

Warning: Because the power of the fan is adjusted by adjusting the step up module, and it can go over the rated voltage of the fan, it is recommended to increase power with caution, also be mindfull that the more you turn the potenziometer the less autonomy you will have out of your battery