Amazon has raised the scale from its cashierless convenience stores.

For the last two years, Amazon has been experimenting with physical storefronts. Their signature brand was Amazon Go, a chain of convenience stores that featured no cashiers or checkout lines. Customers would simply grab what they want while a camera keeps track of what they take, and when they leave the store, the total value of their purchase is debited from an app. After successfully running 26 Go storefronts around the United States, Amazon has decided it’s time for the next step up: a grocery store.

Today, Amazon opened the first Amazon Go Grocery storefront in Seattle, Washington. The property measures in at 10,400-square-feet, and features 5,000 different products available for purchase. In addition to the same kind of small snacks and drinks that the Go convenience stores carry, the Go Grocery features fresh, organic produce, individually wrapped meat and fish shipped in regularly, and alcoholic beverages, among a variety of other daily necessities. As with the convenience stores, there are no cashiers or checkout lines. Aside from the stocking staff, the only human employees in the store are ID checkers for alcohol purchases. The store also does not accept cash for purchases; customers must have the associated Amazon Go app on their phone, which acts as a wallet that the store draws from when the customer leaves.

In addition to an interesting novelty for Seattle natives, the Go Grocery has been a chance for Amazon to flex their technological muscle to investors. Designing the store’s various systems, such as scale-based pricing for loose produce, was quite an undertaking for the company, but one they met and conquered. Amazon Go’ vice president Dilip Kumar is quite optimistic about the growth of the brand, telling the Wall Street Journal that “There’s no real upper bound. It could be five times as big, it could be 10 times as big.”

Kumar hasn’t revealed when and where another Go Grocery will open, but he did divulge that at least 3,000 more Go convenience stores are still in the works for the next couple of years.