Which product holds the Guinness World Record for the fastest-selling consumer electronics item, reaching 1 million units sold in the shortest time period?

The competitive world of retail is filled with impressive records as companies strive to outdo each other with faster launches, wider distribution, and greater customer engagement. Some product launches have made it into the Guinness World Records for their extraordinary scale, speed, or reach. Test your knowledge about one of the most impressive retail launch records in history!

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Apple iPhone 6/6 Plus (2014)
Microsoft Kinect for Xbox 360 (2010)
Sony PlayStation 4 (2013)
Samsung Galaxy S4 (2013)