Pixie Technology uses fobs and augmented reality to locate your lost wallet
[philip lelyveld comment; this is good if you lost something, but useless if it was stolen or moved out of range.]
Los Altos, Calif.-based Pixie sells Bluetooth LE-connected fobs that create a connection with each other. When you are holding a fob, such as the one attached to your smartphone, it establishes a connection to the nearby fob. And then it uses the location information to guide you to the other fob.
That’s where the AR technology comes in. You turn on the Pixie app on your smartphone and point your smartphone camera in a particular direction. If you are within range of another fob, you can see it appear on your camera screen as a digital overlay on the camera’s view. If you move closer, you can home in on the lost item.
If the item is out of range, Pixie will show the street address, time, and date of when it was last seen by the app.
Rivals include Tile and Trackr. The Pixie Points are about an inch long (47 millimeters x 35 mm x 3.4 mm), which makes them a little bulky to put on your keychain, smartphone, or in your wallet.
See the full story here: https://venturebeat.com/2017/04/03/pixie-technology-uses-fobs-and-augmented-reality-to-locate-your-lost-wallet/