The Premier League in England will become the first league in the world to use goal-line technology when it kicks off this weekend.
British-based company Hawk-Eye has fitted its system to all 20 stadiums in the division.
Using seven cameras per goal to detect the ball, it claims to be "millimetre accurate". It has cost each team around £250,000 to install.
Newsbeat took Sunday league and former university goalkeeper Michael Hawkins to Everton's Goodison Park to see the system being used.
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