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

Throughout retail history, certain products have shattered records and made their way into the Guinness World Records. These remarkable items showcase extraordinary achievements in design, sales, or unique characteristics. Test your knowledge about famous products that broke world records and made retail history!

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Apple iPhone (first generation)
Microsoft Kinect for Xbox 360
Sony PlayStation 4
Amazon Echo (first generation)