I want to set up 2FA with a USB key on a Windows 10 system. The instructions tell me to push a button on the usb key. I have never seen a usb with a button on it. So, what is the size of the file, how should the usb be formatted, and which usb with a button would you guys recommend? I might add that I am new to Norton 360 Ultimate with Life Lock. In the past few years, I have had three different credit cards cloned. Last month my bank account was compromised. That was the last straw. I want to make my laptop and personal information as safe as possible. Any help will be greatly appreciated.