Which retail product holds the Guinness World Record for fastest product to reach one million units sold?

The retail industry has seen some incredible world records over the decades - from the largest stores ever built to the fastest product launches in history. This trivia tests your knowledge about extraordinary retail achievements that have made it into the record books. Do you know which retail innovation holds the title for the fastest global adoption?

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Apple's iPhone 6, which reached one million units in 3 days (2014)
Nintendo's Pokémon Go, which reached one million downloads in 13 hours (2016)
ChatGPT, which reached one million users in 5 days (2022)
Amazon's Echo Dot, which reached one million units in 9 days (2019)