I have spoken with this company before. Personally I am not a big fan, pretty basic designs and not much outside what you see from the masses. I think I may have suggested a few things to them at some point but did not come to fruition. I don’t believe they are here on the forum.
Good work trying to encourage them to improve. It is definitely a little confusing why they do not share more about the product and I cannot tell how this stores the private key.
Steeley
it does not store a private key at all - simply a token with your public address. what you can show if you want someone to pay you for example. If you bought the coins you could buy your own holos and put private keys on them as a DIY but if that is the case there are cheaper alternatives.