But the tablet will show me when a payment arrives in time. The QR code is mandatory and redirects to my wallet (which is installed on the tablet). Or how can I check if a BTC is deposited if not using a tablet live in my local store?

Is it that easy to accept bitcoins as a store owner? With my tablet and a mobile wallet? How fast will that work as described here: https://yacuna.com/blog/accept-bitcoin-small-businesses/?

Bill Gates: Bitcoin Is 'Better Than Currency'

Quote: After long remaining mostly mum on Bitcoin, Microsoft’s legendary co-founder Bill Gates has spoken. At the Sibos 2014 financial-services industry conference in Boston, America's richest man just threw his weight behind the controversial cryptocash. ... “Bitcoin is better than currency in that you don’t have to be physically in the same place and, of course, for large transactions, currency can get pretty inconvenient."

http://www.entrepreneur.com/article/238103