How idtrolley works
Download the app from Google Play or the App Store
Sign in through Google, Facebook or Mail.
Tap on "scan barcode" or hold your phone on the NFC tag. Scan the barcode on the handle or let the phone read the NFC tag and the trolley is yours.
To return your trolley scan the barcode on the handle or let the phone read the NFC tag. Do the same with the trolley in front of yours and you're done.