Ángel González:

Located at the corner of Seventh Avenue and Blanchard Street, the Amazon Go store is open to Amazon employees participating in a testing program. It is expected to be open to the public in early 2017.
 Amazon says that what makes the store tick is a combination of computer vision, sensors and machine learning that it calls “Just Walk Out technology.”
 It can tell, say, when a particular shopper picks up a carton of milk from a shelf, and the technology puts it in that shopper’s virtual cart. It can also tell when an item is put back on the shelf — and removes it from the virtual cart accordingly.