How does "touch" functionality work on the 3A Mini? Baffled

Nitrokeys
1

I just received the 3A Mini.

I ran nitropy nk3 test as recommended.

However, I see no “touch button” on the device, since all it is is a USB key. So I randomly touched the metal that sits “atop” the key. The documentation does not mention what you’re supposed to touch or how hard you’re supposed to press.

If I touched the metal in some way, the tests passed. If I didn’t touch the device at all, nitropy nk3 test would sit idle until I touched the key.

How does the touch functionality work? Is it simply a matter of skin contact with the metal “top” of the USB key?

2

Yes, with the small form factor the metal registers via capacity change a user presence as required for the FIDO specification. The larger ones, it blinks and depending on the version there is a touch symbol.

Picture showing the touch sensitive button