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

The retail world is full of fascinating world records - from the largest shopping malls to the most expensive consumer products ever sold. This trivia question tests your knowledge about an extraordinary retail achievement that made it into the Guinness World Records. Think you know your retail history and record-breaking consumer products? Let's see how well you do!

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Apple iPhone (1st generation, 2007)
Microsoft Kinect motion sensor (2010)
Sony PlayStation 2 console (2000)
Amazon Echo smart speaker (2014)