It's obviously not an exact science because the two I can't hear are in the middle.
But it's kinda interesting....check it out..

Hope you are enjoying the weather and reading this later from work..lolx
Jai

-- Modified on 4/26/2008 11:17:46 AM

If I had kids trying to pull one by on their old man, they would be S.O.L.  This old guy can hear them all.

Bogus product.  I just turned 60 and can hear every one of them!  Not sure I could hear the lower ones at 25 feet, but I guess it depends on how high the volume is turned up.