The coin-sized TrackR Bravo is a lost item tracker that gives you three ways to find misplaced items. Attach it to your keys, wallet, pets . . . whatever you want. Use the app to make the Bravo ring if your item is in Bluetooth range. If Bravo is out of Bluetooth range, the app tells you the last location picked up by your phone. Even better: the Crowd GPS feature uses the GPS of all the phones in the TrackR network (tens of thousands of them) to locate it.
of TrackR Bravo