I found this on a site I troll.
http://www.gizmag.com/go/8026/
Their site is here:
http://www.lifesaversystems.com/index.html

I think it looks very interesting, though I haven't heard of it before. It sounds almost to good to be true. The only down side I can see is its price, $390 - $460.
There are several videos on their News page. Again I think it looks and sounds very cool, but I'd need to see some field tests before forking that much money.

What do you think?