After opening several of its cashierless, “just walk out” convenience stores in the Pacific Northwest and Chicago – and planning up to 3,000 total within the next few years – Amazon is beginning to test the same technology in a larger format, The Wall Street Journal has reported.

The Seattle-based behemoth is testing the technology – which employs computer vision, sensor fusion and deep learning to determine what customers take from or replace on shelves – in a bigger space said to be laid out like a large store, the news outlet said, citing unnamed sources. Although the stores currently employing the technology sell groceries, it hasn’t yet been reported that the larger store being tested will be an actual grocery store.