If you are looking for the official 20 metre beep test audio download that is used by the Australian Police, Defense and Fire then you can download the mp3 file from this page.
Don’t be fooled by people that try to sell you the file as they are either selling a pirated copy or have made the file themselves and you run the risk of it not being the official version.
So get your copy of the free beep test audio download below.
(Right Click and Save Link As or Right Click and Save Target As)
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Russ and Mark