Ever wondered how Amazon can deliver orders in the same day? In the company’s regional warehouses, orders are processed immediately; some are shipped less than an hour after shoppers hit the buy button.

Amazon has fulfillment centers in 20 cities across the United States dedicated to ultrafast orders placed through its Prime Now app. Through this service, which is available for Amazon Prime members, customers can opt for items to be delivered in an hour.

Here’s a look at what happens behind the scenes at Amazon’s 40,000-square-foot fulfillment center in New York City.

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