TrackR; THE TRACKING DEVICE WITH ENDLESS POSSIBILITIES.

TrackR is a state-of-the-art tracking device the size of a quarter. It's changing the way we keep track of the important/valuable things in our lives.
How does it work?
It's easy! Install the free TrackR app on your smartphone, connect the app to your TrackR device
and you're ready to go!
Simply attach TrackR to whatever you want to keep tabs on. The
entire process of setting it up only takes 5 minutes or less.
You can attach it to your keys, briefcase, wallet, your latest tech gadgets, car and anything else you don't want to lose. Then use the
TrackR app to locate your missing item in seconds.

Source;CNET.com