The Librem Key is an OpenPGP smart card supporting up to 4096-bit RSA keys and 512-bit ECC keys. These keys are intended to be used as basic security token functions -- they will work with any laptop/PC but reportedly offer extra features when paired with Librem laptops or devices supporting the Heads security firmware.
https://www.phoronix.com/scan.php?page=news_item&px=Purism-Librem-Key [phoronix.com]
In addition to the standard features of a security token (GPG key storage and multi-factor authentication) that the Librem Key can perform on any computer, here are some of the interesting integration options with our Librem laptops we are already looking into with the Librem Key that will make security much more convenient for users who are facing average threats:
Insert the Librem Key at boot and automatically decrypt your hard drive
Automatically lock your laptop whenever you remove the Librem Key
Use your Librem Key to log in
https://puri.sm/posts/introducing-the-librem-key/ [puri.sm]