I can kind of understand the "easier to pinpoint" thing, but I still don't understand why it's safer.  It can be "mistranslated" <i>(for lack of a better term)</i> for many, MANY other sound sources.  In fact, the other point (where it's described as a "natural" sound) is counter-intuitive for the issue.  You <i>want</i> an unnatural sound for it, because it makes you intuitively realize that it's something that needs attention.  If it's a sound you hear commonly, there's a chance you won't even consciously notice the sound unless it's loud enough (which negates his other point where it doesn't have to be that loud).<br>Another comment mentioned that the benefit of using a multi-tone is using the sound imperfections to be able to pinpoint the location as that's how your brain uses both ears to, well, find the location.  However, the issue is that "finding the location" is not the primary goal of the reverse beeping; it's to grab your attention - something that the white noise alarm simply can never do as effectively as beeping.,(reply>), Have you heard it IRL though? It's very loud and distinctive.