It is only one tone. It is a VERY high piched tone. I beleave it is about 110Db, which is pretty loud. After about 10-15 seconds of it going off, it starts to hurt your ears. It feels like there is a pounding on the inside of you ears (which is good for the theif). Let me know if you have any other questions.
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Cyberstang5.0
1992 Mustang GT 5.0
Houston, TX