INDIVIDUAL DEVICES THAT CAN SCAN BARCODES FOR FOOD PURCHASES?

I've got an ICT exam in a couple of days and one of the questions will be the impact on ICT for shopping, disabled or work etc. So anyway I remember once seeing or reading about these small little devices where you can go around scanning what ever item you fancied and it will turn up on your list of items scanned on your shopping cart website. Whats it called?? Has it even been invented yet??
If it's true, it would be very useful to talk about in the exam.

Thanks.
 
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