Which of the following IoT sports products was first to reach over 1 million units sold worldwide?

The sports retail industry has been transformed by Internet of Things (IoT) technology, creating intelligent equipment that tracks performance, enhances training, and revolutionizes how athletes compete. From professional leagues to weekend warriors, smart sports gear is changing how we play, train, and experience athletics. Test your knowledge about this cutting-edge intersection of sports retail and technology!

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Adidas miCoach Smart Ball (soccer ball with embedded sensors to track kick strength, spin and trajectory)
Nike+ FuelBand (activity tracker wristband)
Zepp Golf Swing Analyzer (sensor attachment for golf clubs)
Wilson X Connected Basketball (tracks shots, makes, misses and shooting percentage)