By this way you can sync the balance of the wallet, propagate a transaction and create a backup of the wallet.
Sync the balance of which wallet? The offline one of the one on your Tracking device (Smartphone?)?If it is the offline device, does that mean you can then create Transactions with only the device without having a Tracking device with you? (As you already have everything needed for creating a Tx then). And do they offer a way to sync it without having a tracking device (a software or a website)?
Sync the balance of the offline device (the device prevents you from creating a transaction if the payment amount is bigger than the balance, so you have to sync the balance when you receive bitcoins on the hardbit address)
1/ Scan the QR code generated by the hardbit with your smartphone
2/ Scan the QR code generated by your smartphone with the hardbit
Interesting, so it doesn't only sync the balance but enables the offline device to function without the Tracking device once it was synced (so it syncs outputs?).
Just want to make sure thats how it works. If yes, I'd like to have another way of syncing it than a Tracking device. Maybe someone from the Developers read this and create something. If not, I can do a web based version that does that if I know how the QR code is build and what information it requires