Pros:-
- first it is open source hardware.
- it can protect every file on your system including e-mails, file data, hard drive, your all online account.
- no loop holes to break through it.
- highly secured encrypted storage.
- access your Virtual Private Network via OpenVPN and to log in to some websites via HTTPS, administrate your servers securely via SSH,
all these actions can be done securely with Nitrokey.
Cons:- - nothing.