The technology has proven itself in a small store format. It is harder to get it working in bigger spaces especially those with a high ceiling and larger production rates.

As per a report from the Wall Street Journal, Amazon.com Inc is testing its cashierless checkout technology for bigger stores and in larger spaces. It is experimenting with the technology in Seattle.

WSJ’s report states, while the technology has proven itself to work in a small store format, it is harder to get it working in bigger spaces, especially those with higher production rates and and taller ceilings.

The checkout-free system, already operational in many Amazon Go stores, allows consumers to buy things with the help of a smartphone app by tracking what they pick up from the shelves and what they put back and bill their credit cards once they leave.