Interestingly, the link given on the first thread is for a different whistle entirely. :
http://www.newitts.com/product/OS-22...ic_whistle.htm
A hand-held electronic whistle with three different tones. I wonder if that's used for basketball anywhere. It might be a good tool for a score-keeper's table in the summer outdoor season instead of those annoying air horns. $40 for a whistle is a little steep, though. Anyone run into one of these?