People walk by the Amazon Go brick-and-mortar grocery store without lines or checkout counters, in Seattle Washington, U.S. December 5, 2016. REUTERS/Jason Redmond
(Reuters) – Amazon.com Inc (AMZN.O) is testing its cashierless checkout technology for bigger stores with larger spaces and experimenting the technology in Seattle, the Wall Street Journal reported on Sunday.
The technology functions well in a small store format but is harder to use in bigger spaces with higher ceilings and more production, the report on.wsj.com/2U6hwnB added, citing a source.
The checkout-free system which is already operational in certain Amazon Go stores, allows shoppers to buy things with the help of a smartphone app by tracking what they pick up from the shelves and what they put back, billing their credit cards after they leave.
Amazon did not immediately reply to a request seeking comment.

vCard.red is a free platform for creating a mobile-friendly digital business cards. You can easily create a vCard and generate a QR code for it, allowing others to scan and save your contact details instantly.
The platform allows you to display contact information, social media links, services, and products all in one shareable link. Optional features include appointment scheduling, WhatsApp-based storefronts, media galleries, and custom design options.
Reporting by Mekhla Raina in Bengaluru; Editing by Lisa Shumaker