This is Amazon's grocery store of the future: No cashiers, no registers, and no lines

Amazon is breaking into physical retail in a new way.

The online retail giant revealed a new kind of physical store concept in a video published on Monday.

The store, $4, doesn't work like a typical Walmart - instead, shoppers use an app, also called Amazon Go, to scan the products they plan to buy, then they can walk out of the building without waiting in a a checkout line. 

The idea is that Amazon's machine learning technology can automatically identify when a product is added to your cart, so you don't have to do it yourself. When you leave the store, Amazon automatically charges your Amazon account. 

The stores will sell ready-made food, staples like bread and milk, and other grocery products. Amazon says their stores are about 1,800 square feet, so they are relatively small compared to big supermarkets. 

$4 in Seattle, Washington, and it will open to the public in early 2017.

Here's what it's like to shop in one:

Disclosure: Jeff Bezos is an investor in Business Insider through hispersonal investment company Bezos Expeditions.