TrackR bravo - Never lose anything again with the coin sized bravo!. Okay, Crowd based GPS isn't perfect. Any item with a TrackR will only be located if another TrackR user gets within 100 feet of it. But, there are people all over the country using these things, and the more that use them the better the coverage. I am buying some to put in my old cars. I know, it isn't likely that anyone wants my old beaters; but, better safe than sorry. I am also getting some of these for my keys, wallet, and other valuables.