Which product holds the Guinness World Record for the fastest-selling consumer electronics item, selling at a rate of 8 units per second during its first 4 days on the market?

The business world is full of remarkable achievements, but some product launches have literally made it into the Guinness World Records. From tech gadgets to retail phenomena, certain products have broken all sales records in astonishingly short timeframes. Test your knowledge about these record-shattering product launches that changed retail history and set benchmarks that competitors still dream of matching.

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Apple iPhone X (2017)
Sony PlayStation 4 (2013)
Nintendo Switch (2017)
Amazon Echo Dot (2016)