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Siren?

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It is an RSG siren from the UK. It is in fact very unusual to hear that anywhere outside the UK. The tone heard is the UK Wail, and, along with the Yelp and Hi-Lo tones are used on the London Metropolitan Police cars and many other UK emergency vehicles. It is also very unusual that the distortion/screech of the siren is because it is using a tubular speaker, which again, is only used in the UK for budget and spacing reasons.

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