Long then short beep when putting car into reverse

Hey everyone,

This has only started happening today but when I put my car in reverse, there's the usual beep then a couple seconds later there a loud long beep then a short beep right after it. It's at a different pitch from the parking sensor beeps so I don't know what it is. I thought it was one of the sensors had failed but I tried all of them and they're all still fine so I'm just curious to what the noise is. No warning lights or anything appear on the dash so I'm not sure if I should be concerned or not.

Any help would be appreciated. Thank you,
Dylan Hay
 
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