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There is a certain list of words in order that is your recovery phrase and if you do lose your device you can recover your lost coins with that phrase. Every device will require you to use different apps, typically working best over google chrome. Transferring is quite easy also once you get the UI. I'm not too sure what you mean by scanner though

I mean: Can I scan a QR code with it in order to make a payment?

Yeah, the addresses function the same as Coinbase, poloniex, etc. the fees are also the same decimal amount typically. They do a good job of making it pretty convenient.