An artificial intelligence-based system is being developed to spot what goods shoppers pick up in convenience stores so that they can be charged without having to queue at the till.

A prototype version of the technology by the San Francisco start-up Aipoly is on show at the CES tech show.

Amazon is known to be working on similar technology.

BBC Click's Lara Lewington tried it out.

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See more at Click's website and @BBCClick.