Not sure yet, but it's just a microcontroller (esp32), which is somehow supposed to work with a browser extension implementing the nip-07 I mentioned above.

You still have to use a browser extension. What I'll have to figure out is how exactly is communication between the browser extension and the device is supposed to work.

What I believe could be the case would be, that it would basically implement the nip07 itself and use the extension just to pass the data along to the client.