|Photo from Engadget|
You can even use your phone to activate the blinking LED or speaker on the puck to help you track it down.
Check out more pictures and a video of them at Engadget, and view the Indiegogo page to pre-order one. They're expected to ship in a few months.
I personally could use a several of these. I hope they actual reach retail availability...almost everyone I know could benefit from one or two of these.