I presume it uses RFI technology....
I can#'t wait 'til they have RFI in place of bar codes... would mean that you just throw everything into your trolley, take it to the checkout and the detector knows exactly what you've bought - no unloading everything onto the checkout desk to be scanned and then back into the trolley....
Not sure you'd want it on a debit car tho - I'd suggest you keep it wrapped in tin foil when not in use...