YUBICO YubiKey 4 Nano

YubiKey 4 Nano is a USB device that you use in combination with your username/password to prove your identity. With a simple touch, YubiKey 4 Nano protects access to computers, networks, and online services.  Key selling points

• Easy and safe
  No more reaching for your smartphone to type passcodes that you receive via SMS or from an authenticator app. Just plug in your YubiKey, tap, and it does the rest for you.
• Works out of the box
  Use it with popular services. Configurable for computer login.