where does your reverse gear beep come from?

[EssexPorsche]

Tom,
Mine has it as a factory option,
That is the pattern : engage tone, followed by intermittent beeps which increase in speed as the objects become closer until a continuous beep is sounded - which signifies you are close or have even hit the object - ha ha.

Its deffo internal but i have never really paid much attention to where it comes from - its almost like its under the seat?

I'll have another listen this weekend and let you know