oh, it's not just a NFC card it's a fairly large piece of hardware

it's a bit bulky, have you got plans for something smaller, maybe even doesn't have any inputs except maybe a button and an indicator light?

also, what protocol is it working with?

i quite like the concept of a device that has only NFC and USB and no wifi or mobile radio that is just for keeping my keys secure though, i could maybe go for this especially if i can use it to replace my whole login flow for browser and pc (linux)