Britain’s biggest retailer Tesco on Tuesday opened its first check-out free food store in the wake of similar UK moves by Amazon and German supermarket group Aldi.

The small Tesco supermarket in central London uses cameras and weight-sensors to identify items customers are carrying on exiting the store, before charging them via the company’s smartphone app.

Our latest innovation offers a seamless checkout for customers on the go, helping them to save a bit more time- Tesco Convenience managing director Kevin Tindall

“We are constantly looking for ways to improve the shopping experience and our latest innovation offers a seamless checkout for customers on the go, helping them to save a bit more time,” Kevin Tindall, managing director at Tesco Convenience, said in a statement.

The purchasing of age-restricted products such as alcohol will still require checks by staff.

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