Security key
Security key for accessing different websites (dual 2FA authentication) and protecting access to a database containing my many passwords. Easy to configure and even easier to use. All you have to do is plug it into a USB port or use NFC, and validate by touching it. It's also possible to connect to a Windows machine (without a password), a TOUCH ID of sorts.
And much more besides.
I'm very happy with it, it's the second one I've used for BACKUP.