Which product holds the Guinness World Record for 'fastest-selling consumer electronics item', selling 8 million units in its first 60 days on the market?

Product launches can make or break a company's reputation and market position. Some product debuts have been so spectacular they've earned their place in the Guinness World Records. This trivia question tests your knowledge about one of the most remarkable product launches in retail history that set a world record. Can you identify which product's launch broke all expectations and entered the record books?

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Apple iPhone 6/6 Plus (2014)
Microsoft Kinect for Xbox 360 (2010)
Sony PlayStation 4 (2013)
Nintendo Switch (2017)