This automatic item scanner at the self-checkout : r/Damnthatsinteresting
Supermarket self-checkout kiosk
Amazon.com : Bluetooth Ring 1D 2D QR Barcode Scanner,Wearable Wireless Finger Mini Bar Code Reader Scanner Compatible for Windows, Mac OS, Android 4.0+, iOS Support Scan QR PDF417 DataMatrix on Screen and
Amazon.com : Handheld USB Barcode Scanner Wired Automatic 1D Bar Code Reader for Supermarket, Convenience Store, Warehouse : Office Products
New scanning technologies help retailers improve the checkout experience | Zebra Blog