Online shoppers on Wednesday ordered more than 34 million items on Amazon Prime Day, making it a bigger sales day for the retailer than the biggest Black Friday in history.

Prime customers ordered 398 items per second during Wednesday’s sale, which was held to mark the 20th birthday of Amazon.com. Prime members pay $99 a year and receive free two-day shipping, along with access to the company’s streaming music, videos and other services.

During the sale more users signed up to become Prime members than on any other single day, Amazon said.

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