This simple and small device can help you "get found" if you get lost. It's lightweight and reasonably affordable, worth it when you need it. This store also suggests you use it with your kids, I think that's a great idea. It's a cheap deal for safety! (via Staff)

Before you get too excited about this thing, read some of the reviews involving some real (i.e. not company sponsored) testing.

eg: http://www.equipped.org/tracme_eval.htm
http://www.webersar.org/Newsletters/SARnews1207.pdf
and http://www.bymnews.com/news/newsDetails.php?id=13238

Then make up your own mind if it is really suitable for what you do....