Do not even think about buying these USB sticks. USB miners are no longer profitable, USB bitcoin mining has died down in profitability due to multiple factors. USB miners made it easy for you to get started with bitcoin mining, however, due to increasing adoption, bitcoin halving, and other factors, the profitability has died.

Sapphire Block Erupters were the first-ever miners to be created. Releasing the power of 330Mh/s of hash power, the user would be able to receive nothing less than $0.01/month thus not enough to earn profitability.

Relation to the ASIC bitcoin miner USB, it generates a power of 25 gigahash/second which is, nowadays; almost nothing but not that much due to the rise in the difficulty of obtaining Bitcoins. The device will need active cooling as it gets hot due to the processing i.e 80 degrees on the heatsink. So how does it work?

Firstly, you insert the device into the computer, download the drivers, download the mining software which is the CG miner.
Inform the software with a batch file on the BTC address, where it should send the payment to and to perform either a solo or pool mining and setting the frequency in which you can run it depending on the frequency you get more hash rate with higher power consumption or less hash rate with low power consumption.
You will be then ready to mine.

Anyways, Don't waste your money. Buy Crypto and hold them. Good Luck