If it requires an NFC connection to chech the current balance, why the banknote is different from a mobile wallet? It's only that if you hand it over, it does not require a transaction to wait for?
...They look like a pretty cool hardware wallet but I couldn't consider them bank notes.
I know it's easier to handle for a person who is not so tech savvy, but what in the other topic of this I've already asked the founder: what happens if I have this banknote (card) and by the time when I want to hand it over, the secure chip fails inside? I know that the coins will still sitting on the blockchain but how I can move them if I can't make a backup?
If I lose it, then it's the same like I lose a real banknote, because it's my fault, but if there is a hardware fault, that's not the same...