Post by TIME

A small chip inside this year’s World Cup match ball is helping referees make faster and more accurate calls. The sensor tracks the ball’s movement 500 times per second, capturing every touch and movement in real time. This gives officials more precise data to review during key moments of the match, according to Adidas, the company behind the "smart" ball. Because the sensor needs power, the ball needs to be charged before kickoff. Here’s how it works. Editor’s note: A previous version of this video incorrectly described the rechargeable built-in sensor in the World Cup match ball. This year's was the second to have that capability, not the first.

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