When you say for a sale, do you mean it can be used to buy things?
If I could scan it and spend btc without taking my phone out I would buy it... but I don't think it works like that. 🙂
Discussion
You have to clear out an entire piece, you can't deduct part-amounts.
You can give it to someone, like a gift card.
Ah I see. As I understand it the card has 10 slots. When you scan the card the device you scan on is then used to choose which slot the funds are cleared from?
I may have to play around with one until I understand all the benefits...