why does basketball use a horn/buzzer as a time out signal?

why does basketball use a horn/buzzer as a time out signal? why not just use whistle or scream on microphone?
buzzers sound unpleasant.

?2015-08-01T05:56:33Z

Tradition

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?2015-08-01T06:51:24Z

So it can be heard all over the court

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