With Trakr discs, you can track the location of anything. Anything. A bike; a wallet; a cat; a phone. Anything. Just attach one of these Trakr discs to whatever you want to locate and an app will tell you where it is in real time. The app is free and the discs cost under $20@ when buying 4 or more.
Link to Trakr Website
PS: This not only is like the best new gizmo ever, it makes for fantastic birthday and holiday presents, including stocking stuffers and, for Halloween, kids will much prefer them to my other favorite, Brillo pads.