https://phys.org/news/2018-12-smaller-amazon-seattle-retailer-eyes.html

The Amazon Go store is only open to company employees and their guests. It follows three existing Go stores in Seattle—including the first, which opened in January—and others planned in at least three major U.S. cities.

The small-format Go store follows reports that Amazon is testing its cashierless technology—a system of cameras, sensors and a company smartphone app that enables payment via an Amazon account—in larger retail settings.