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there own voices :O

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Q: What did nhl referees use before whistles?
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Which hockey whistles should you use to referee?

Any standard whistle used by referees in any other sport will work.

What Equipment that referees and officials use?

Referees and officials commonly use equipment such as whistles, flags, cards (yellow and red), a watch or stopwatch for timekeeping, and a notebook to keep track of game events and infractions. Additionally, they may also use communication devices like headsets to stay connected with other officials during the game.

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Before using a whistle, officials used hand signals or flags to communicate calls during sports games or other events. Whistles eventually became popular for their loud and clear sound that could easily grab players' attention and signal them to stop or start play.

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