Wait.. What do you mean by hardware wallet? It's kind of USB or what? Because I think it looks like exactly a USB. I'm still new into this stuff
I thought it was a USB too

. But after I do some research, the hardware wallet act as a flash drive to store your cryptocurrency holdings.
These devices could make secure payments and also manage your cryptocurrencies without exposing any sensitive information. It's very secure.
And right now, credits make their own hardware wallet and according to the official announcement, it will be completed in Q1 2020.